In summary, the invention of the Haber process led to the production of synthetic fertilizers, which reduced the demand for natural nitrates from mines like Humberstone, ultimately leading to its closure.
The invention of the Haber process, which is a method of synthesizing ammonia from nitrogen and hydrogen gas, allowed for the production of large amounts of fertilizer. This increased the amount of farmland that could be cultivated and substantially increased crop yields. As a result, the demand for natural resources like nitrate-based fertilizers, which were previously extracted from mines like Humberstone in Chile, decreased significantly.
Humberstone was one of the largest nitrate mines in Chile and was known for producing high-quality nitrate fertilizers. However, the increased production of synthetic fertilizers through the Haber process meant that the demand for natural nitrate-based fertilizers gradually declined. The falling demand for natural nitrates eventually led to the closure of many nitrate mines like Humberstone in Chile.
In addition to the Haber process, other factors such as the discovery of cheaper sources of natural nitrates in other parts of the world and the decline in the price of nitrate also contributed to the closure of the Humberstone mines.
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0. 450 kg of gasoline is spilled. If the density of gasoline is 0. 665 g/mL, what volume of gasoline is spilled?
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Please help me!! Enthalpy change: 20 points!! Please write it out
H-H: 432 kJ/mol,C-H: 413 kJ/mol,∆H = -451 kJ/mol.The rection is H-H + C-H => H + H + H- Therefore,this reaction is exothermic since the enthalpy change is negative.
What is enthalpy ?Enthalpy is a thermodynamic property that is a measure of the total energy content. It is the sum of the internal energy and the product of its pressure and volume. It is expressed in units of energy per unit mass, such as joules per kilogram (J/kg) or kilocalories per kilogram (kcal/kg).It is an important factor in the study of thermodynamics.
For reactants, two hydrogen molecules must be broken down into two hydrogen atoms (H-H bond energy = 432 kJ/mol).For products, one molecule of carbon monoxide must be formed from one carbon and oxygen atom (C-O bond energy = 799 kJ/mol). Therefore, the enthalpy change for this reaction is calculated as follows:ΔH = (799 kJ/mol) - (2 x 432 kJ/mol) = -5 kJ/mol.
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a 10.0 ml sample of vinegar, which contains acetic acid, is titrated with 0.50 m naoh, and 15.6 ml is required to reach the equivalence point. what is the molarity of the acetic acid?
The molarity of the acetic acid, when it is titrated with 0.50M NaOH, and 15.6 ml of it is required to reach the equivalence point, is 0.78 M.
The molarity of the acetic acid can be calculated using the following formula:
Molarity (M) = (Moles of Acid) / (Volume of Acid)
First, the moles of acetic acid must be determined. To do this, the moles of sodium hydroxide (NaOH) used to titrate the acetic acid must be determined.
Moles of NaOH = (Molarity of NaOH) x (Volume of NaOH)
Moles of NaOH = (0.50 mol/L) x (0.0156 L)
Moles of NaOH = 0.0078 mol
Since one mole of NaOH is needed to neutralize one mole of acetic acid, the moles of acetic acid are equal to the moles of NaOH, or 0.0078 mol.
Next, the volume of the acetic acid must be determined. Since 10.0 mL of vinegar was used, the volume of acetic acid is also 10.0 mL.
Now that the moles of acetic acid and the volume of acetic acid have been determined, the molarity of the acetic acid can be calculated.
Molarity (M) = (Moles of Acid) / (Volume of Acid)
Molarity (M) = (0.0078 mol) / (0.010 L)
Molarity (M) = 0.78 mol/L
Therefore, the molarity of the acetic acid is 0.78 mol/L.
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To begin today’s experiment you wash a 125 ml erlenmeyer flask and set up the experiment as show in figure 1. After allowing your water to boil for 10 minutes you remove the flask, clamp it and immerse it in water. After performing your calculations you see that your data is a little higher than everyone else’s. What is the probable source of the error?
One potential source of error could be a measurement error, either in the volume of water added or in the temperature of the water. Another potential source of error could be a problem with the calibration of the thermometer used to measure the temperature of the water.
However, one of the most likely sources of error in this case is the presence of air bubbles in the erlenmeyer flask during the experiment. Air bubbles can act as an insulator, trapping heat and preventing the water from reaching the same temperature as the rest of the water in the flask. This can result in an inaccurate measurement of the water's temperature and ultimately affect the calculation of the experimental data.
To reduce the impact of air bubbles in future experiments, it is recommended to ensure that the erlenmeyer flask is thoroughly cleaned and free of any debris or contaminants that may trap air bubbles. Additionally, carefully swirling the flask during the heating process can help to dislodge any trapped air bubbles and ensure that the water is evenly heated.
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Provide the products and balance the reaction below for the complete combustion of the fatty acid octanoic acid, C8H16O2
C8 H16 O2 (s) + O2(g) →?
A hydrocarbon comprises 92.3% carbon by mass and 7.7% hydrogen by mass. The compound's empirical formula will be oose answer: CH CH5, CH CH3, CH CH4.
What is octanoic acid's fatty acid?Octanoic acid is a straight-chain saturated fatty acid derived from heptane in which one of the terminal methyl group's hydrogens has been replaced by a carboxy group. Caprylic acid is another name for octanoic acid. It functions as an antibiotic agent, a human metabolite, and an E. coli metabolite.
Along the chain of saturated fatty acids, there are no double bonds or any functional groups. In the sense that all carbons are "saturated," the term "saturated" refers to hydrogen (apart from the carboxylic acid [-COOH] group)
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[see photo] please help!!
option a is the answer
10
what concentration of iodide is needed for the reaction to change color at 12 minutes? (rate: 0.028 mM/12 min)
According to a first-order rate law with a rate constant of 0.0058 min1, the reaction requires a concentration of iodide of about 4.83 mM before the color changes after 12 minutes.
How does the rate of the reaction change as the concentration of iodide ions rises?The demonstration in the movie shows that larger iodide ion concentrations accelerate the first reaction, hastening the depletion of thiosulfate. Because of this, the reaction's end-signaling color shift happens faster.
rate = k[I-]
[I-] = rate / k
Plugging in the given rate (0.028 mM/12 min), we get:
[I-] = (0.028 mM/12 min) / k
[I-] = (0.028 mM/12 min) / (0.0058 min⁻¹)
[I-] ≈ 4.83 mM
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What is the mass % of H in Mn(C₂H₂O₂)4?
The percent mass of H is 3.3%. This can be found from the data of the elements that we have in the problem.
How do you find the percent mass of an element in a compound?To find the percent mass of an element in a compound, you need to follow these steps:
Determine the molar mass of the compound: This is the sum of the atomic masses of all the elements in the compound. You can find the atomic masses of elements on the periodic table.
Determine the molar mass of the element: This is the atomic mass of the element as it appears in the compound.
Calculate the moles of the element in the compound: This can be done using the formula: Moles = Mass of element / Molar mass of element.
Calculate the percent mass of the element in the compound: This can be done using the formula: Percent mass = (Moles of element x Molar mass of element / Molar mass of compound) x 100%.
Molar mass of the compound = 239 g/mol
Mass of H present = 8 (1) = 8
Percent of H = 8/239* 100/1
= 3.3%
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A 150.0 gram sample of a white powder contains 61.05 g of carbon, 7.65 g of hydrogen, and 81.30 g of oxygen. What is the empirical formula of this compound?
Answer:
C2H3O2 (acetate)
Explanation:
61.05 g C x 1 mol C / 12.01 g C = 5.083 mol C
7.65 g H x 1 mol H / 1.01 g H = 7.57 mol H
81.30 g O x 1 mol O / 16.00 g O = 5.081 mol O
Divide by lowest number
5.083 / 5.081 = approx. 1 mol C
7.57 / 5.081 = approx. 1.5 mol H
5.081 / 5.081 = 1 mol O
so ratio of moles in this compound are 1 mol C : 1.5 mol H : 1 mol O
Multiply by 2 to get whole number mol ratios
--> empirical formula is C2H3O2 (acetate)
Hydrochloric acid is a strong acid.
Ethanoic acid is a weak acid.
Describe a reaction that could be used to show the difference between a weak acid and a
strong acid.
You should explain why the weak acid and the strong acid give different results.
Answer:
One reaction that can be used to show the difference between a weak acid and a strong acid is the reaction with magnesium. When magnesium is added to hydrochloric acid, a vigorous reaction occurs, releasing hydrogen gas and forming magnesium chloride:
2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)
In contrast, when magnesium is added to ethanoic acid, a slow reaction occurs, releasing hydrogen gas and forming magnesium ethanoate:
2CH3COOH(aq) + Mg(s) → Mg(CH3COO)2(aq) + H2(g)
The reason for the difference in reaction rate between the two acids is due to their different levels of dissociation in water. Hydrochloric acid is a strong acid and completely dissociates in water, releasing a high concentration of hydrogen ions (H+) in solution. In contrast, ethanoic acid is a weak acid and only partially dissociates in water, releasing a low concentration of hydrogen ions in solution. As a result, the reaction between magnesium and hydrochloric acid is more vigorous because of the high concentration of hydrogen ions in solution, whereas the reaction between magnesium and ethanoic acid is slower due to the lower concentration of hydrogen ions in solution.
Explanation:
Answer:
correct comparative pH, such as, 0-3 (strong) 4-6 (weak) • named reaction, such as, with a reactive metal or a named carbonate • comparative results or observations of the named reaction, such as, faster reaction (strong) or greater volume of gas produced in a given time (strong)
Explanation:
Explanations of different results • weak acids are only partially ionised in aqueous solution • strong acids are completely ionised in aqueous solution/ greater concentration of H+ ions • aqueous solutions of acids at the same concentration/ powder, same temperature
Penelope's friend Joe gives her a ring for Valentine's Day, which he said is 14k white gold. Penelope's friend Daksha thinks it's actually composed of nickel. Describe a process/experiment that Penelope could conduct to find out for sure.
Dimethylglyoxime is a chemical that is present in this kit (in solution). KIT The solution will turn pink when used to clean a metal object with such a cotton swab when nickel is present in the Penelope's 14k white gold ring.
Check for the presence of nickel in white gold:White gold was first created to mimic platinum (a white metal). White gold is typically an alloy containing around 75% gold or around 25% nickel and zinc. It would be approximately 75% pure gold if it had an 18 karat stamp.
The question:
Joe, a friend of Penelope's, presents her with a 14k white gold ring on Valentine's Day. Daksha, a friend of Penelope's, believes it is truly made of nickel. Penelope may use the following procedure or experiment to determine this for sure:
You can get a nickel test kit if you're buying jewelry and are unsure if it includes nickel. Dimethylglyoxime is a chemical that is present in this kit (in solution). This chemical is used without harming the thing being evaluated.The solution turns pink when used to clean a metal object with such a cotton swab when nickel is present. This test may not detect trace levels of nickel, but it is typically a reliable jewelry detector.Know more about white gold
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The equation below represents a chemical reaction that occurs in living cells.
C6H12O6 + 6O2 ------> 6CO2 + 6H2O + energy
The reactants contain a total of _____?
atoms.
Answer:
Explanation:
The total number of atoms in the reactants can be determined by counting the atoms on each side of the equation.
On the left side, there are:
6 carbon atoms (C)
12 hydrogen atoms (H)
6 oxygen atoms (O)
On the right side, there are:
6 carbon atoms (C)
12 hydrogen atoms (H)
18 oxygen atoms (O)
Therefore, the reactants contain a total of:
6 + 12 + 6 = 24 atoms (of carbon, hydrogen, and oxygen)
Answer: 24 atoms
Show that you understand energy and its forms, including potential, chemical, and thermal energies by describing how gasoline can have potential, chemical, and thermal energy.
Gasoline can have potential energy because it is stored in a container, chemical energy because of the energy stored in its molecular bonds, and thermal energy because of the heat produced when it is burned.
How can gasoline have potential, chemical, and thermal energy?Gasoline is a fuel that contains potential, chemical, and thermal energy.
Potential energy is the energy that an object has due to its position or configuration. In the case of gasoline, it has potential energy because it is stored in a tank or container and has the potential to be used as fuel for a car or other combustion engine.
Chemical energy is the energy that is stored in the bonds between atoms and molecules. Gasoline has chemical energy because it is made up of molecules that contain stored energy in the form of chemical bonds. When gasoline is burned in an engine, the chemical energy is released and converted into thermal energy.
Thermal energy is the energy that is related to the temperature of a substance. When gasoline is burned in an engine, it produces thermal energy as a result of the chemical reactions that take place. This thermal energy is then converted into mechanical energy that powers the car's engine.
In summary, gasoline can have potential energy because it is stored in a container, chemical energy because of the energy stored in its molecular bonds, and thermal energy because of the heat produced when it is burned. These three forms of energy are all interrelated and can be converted from one form to another.
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Draw resonance structures to show in which position nitrobenzene will nitrate to form dinitrobenzene
In order to create 2,4-dinitrobenzene and 2,6-dinitrobenzene, respectively, nitrobenzene can be nitrated in either the ortho or para positions.
Draw resonance structures to show in which position nitrobenzene will nitrate to form dinitrobenzeneA nitro group (-NO2) is substituted for a hydrogen atom (-H) on the benzene ring during the nitration process. The nitrobenzene resonance structures demonstrate that the electrons are distributed between the nitro group and the benzene ring. Due to the partial negative charge they have as a result of the nitro group's electron-withdrawing effect, the ortho and para positions are more vulnerable to electrophilic attack as a result of this delocalization.
The following diagram depicts the resonance structures for the ortho and para nitration products:
Ortho nitrification
H H
| |
H---C---NO2 H---C---NO2
| |
H NO2
Para nitration:
H H
| |
H---C---NO2 NO2---C---H
| |
NO2 H
The nitro group is situated on the 2 and 4 positions of the benzene ring in the ortho nitration product, whereas it is situated on the 2 and 6 positions in the para nitration product.
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can someone help me answer this please.
with solution and answer. thanm you so much!!
Momentum-
[tex] \:\:\:\:\:\:\:\:\:\:\:\:\star\sf \underline {P = mv}\\[/tex]
Where-
P = Momentum m = Mass of Object v = Velocity of objectAs per question, we are given -
Distance travelled by car= 12 kmTime taken = 20 minutesConvert 20 minutes to hour-
1 minute = 1/60 hourTherefore, 20 minutes = 20/60 = 1/3 hour
[tex] \:\:\:\:\:\:\longrightarrow \sf\underline{Speed _{(car)} = \dfrac{Distance }{ time}}\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)} = \dfrac{12}{\dfrac{1}{3}}\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}=12 \times 3 \\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}= 36 km/h \\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}= \dfrac{36 \times 1000}{3600}\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf Speed_{(car)}= \dfrac{\cancel{36} \times 10\cancel{0}\cancel{0}}{\cancel{36}\:\cancel{0}\cancel{0}}\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf \underline{Speed_{(car)} = 10 m/s }\\[/tex]
Mass = 30,000 gmMass = 30,000/1000 kg =30kgNo that we have obtained the velocity of the car is 10 m/s and the mass of the car is 30 kg,so we can put all the values and find for momentum of car -
[tex] \:\:\:\:\:\:\longrightarrow \sf \underline{Momentum_{(car)} = mv}\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf Momentum_{(car)} = 30 \times 10\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf\underline{ Momentum_{(car)} =300 kgms^{-1}}\\[/tex]
Therefore, the momentum of car is 300 kgm/s.What is meant by an organism’s body functions
with added heated calcium carbonate decomposes to form calcium oxide and carbon dioxide. in which direction will the equilibrium shift if the temperature of the reaction is lowered? explain,
When the temperature of a reaction is lowered during the decomposition reaction of calcium carbonate to calcium oxide and carbon dioxide, the equilibrium will shift towards the reactants.
Exothermic reactions release heat energy into the surroundings, which means that the temperature of the reaction is lowered when it is proceeding from reactants to products. So, when the temperature is reduced, the system will try to increase the temperature by shifting the equilibrium towards the endothermic side, which means towards the reactants side.
Here, we know that decomposing heated calcium carbonate into calcium oxide, and carbon dioxide is an endothermic reaction because it requires heat. As a result, the equilibrium will shift towards the left (reactants side) to compensate for the decrease in temperature. This will increase the concentration of reactants and decrease the concentration of products, ultimately, it will cause the equilibrium to shift in the direction of reactants.
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With added heated calcium carbonate decomposes to form calcium oxide and carbon dioxide, the equilibrium will shift towards the reactant side if the temperature of the reaction is lowered.
According to Le Chatelier's principle, if any change is applied to a system at equilibrium, the system reacts in such a way as to counteract that change.
The principle explains that an increase in temperature causes equilibrium to shift in the endothermic direction, while a decrease in temperature causes it to shift in the exothermic direction.
When [tex]CaCO_3[/tex] is heated, it decomposes to form CaO and [tex]CO_2[/tex].
The balanced chemical equation is:
[tex]CaCO_3 (s)\rightarrow CaO (s) + CO_2 (g)[/tex]
The given reaction is an endothermic reaction as it absorbs heat.
Therefore, when the temperature increases, the equilibrium shifts towards the product side to counteract the change. On the other hand, when the temperature is decreased, the equilibrium shifts towards the reactant side to counteract the change.
In this case, the equilibrium will shift in the backward direction to produce more [tex]CaCO_3[/tex].
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If water is added to 1 mole of sodium chloride in a flask until the solution is 1 liter what is the molarity of the solution? What is the molarity when water is added to 2 moles of sodium chloride to make 0. 5 liters?
Answer:
Explanation:
Molarity = moles /liters
M= 1/1 = 1M
B) 2moles/0.5 L = 4.0 M
I don’t know what the answer are. Can some one please help.
The atomic radius, Pauling ionic radius, and first ionization energy of Bromine (Br), Chlorine (Cl), Magnesium (Mg), and Sodium (Na) are given in the attachment.
What is the atomic radius of an atom?A chemical element's atomic radius, which is typically the average or normal distance between the nucleus's center and the outermost isolated electron, serves as a gauge for the size of its atom.
Only by measuring the separation between the centers of two adjacent atoms and halving that distance can one determine the radius of an atom.
The ionic radius is the size of an ion.
The first ionization energy is the energy required to remove the first electron from an atom
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Can someone please help with this chemistry question?
If you have 3.45 mol sample of iron, how many grams of Fe₂O₃ will there be after the iron has rusted completely is 193.2 g Fe₂O₃.
Rust is a multi-paradigm, general-purpose programming language developed by Mozilla Research. It is designed to be a safe, concurrent, practical language that supports functional and procedural programming. Rust is syntactically similar to C++, but its memory safety features make it safer and more secure. It also provides better performance than many other languages. Rust provides memory safety by using a type system and a borrowing system to ensure that memory is only accessed when it is valid.
The balanced equation for the rusting of iron is:
Fe + O₂ -> Fe₂O₃
To calculate the grams of Fe2O₃ produced, we must first convert 3.45 mol Fe to grams.
Molar mass of Fe = 56.0 g/mol
Therefore, 3.45 mol Fe x 56.0 g/mol = 193.2 g Fe
Now, according to the balanced equation, 1 mol Fe produces 1 mol Fe₂O₃.
So, 193.2 g Fe will produce 193.2 g Fe₂O₃.
Therefore, the answer is 193.2 g Fe₂O₃.
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Determine the total mass of Cu produced when 1.08 grams of Al reacts completely with 9.58 grams of CuSO4 to produce 6.85 grams of Alz(SO4)3.
Answer:
the balanced chemical equation for the reaction between aluminum (Al) and copper(II) sulfate (CuSO4) is:
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
This equation tells us that two moles of Al react with three moles of CuSO4 to produce one mole of Cu, and also produces one mole of Al2(SO4)3.
To determine the mass of Cu produced, we need to use the given masses of Al and CuSO4 to calculate how many moles of each reactant are present, and then use the mole ratios from the balanced equation to determine the moles of Cu produced. Finally, we can convert the moles of Cu to grams using its molar mass.
First, we calculate the moles of Al and CuSO4:
moles of Al = 1.08 g / 26.98 g/mol = 0.0400 mol
moles of CuSO4 = 9.58 g / 159.61 g/mol = 0.0600 mol
Next, we use the mole ratios from the balanced equation to determine the moles of Cu produced:
moles of Cu = (0.0400 mol Al) × (3 mol Cu / 2 mol Al) = 0.0600 mol Cu
Finally, we convert the moles of Cu to grams using its molar mass:
mass of Cu = 0.0600 mol × 63.55 g/mol = 3.81 g
Therefore, the total mass of Cu produced when 1.08 grams of Al reacts completely with 9.58 grams of CuSO4 is 3.81 grams.he balanced chemical equation for the reaction between aluminum (Al) and copper(II) sulfate (CuSO4) is:
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
This equation tells us that two moles of Al react with three moles of CuSO4 to produce one mole of Cu, and also produces one mole of Al2(SO4)3.
To determine the mass of Cu produced, we need to use the given masses of Al and CuSO4 to calculate how many moles of each reactant are present, and then use the mole ratios from the balanced equation to determine the moles of Cu produced. Finally, we can convert the moles of Cu to grams using its molar mass.
First, we calculate the moles of Al and CuSO4:
moles of Al = 1.08 g / 26.98 g/mol = 0.0400 mol
moles of CuSO4 = 9.58 g / 159.61 g/mol = 0.0600 mol
Next, we use the mole ratios from the balanced equation to determine the moles of Cu produced:
moles of Cu = (0.0400 mol Al) × (3 mol Cu / 2 mol Al) = 0.0600 mol Cu
Finally, we convert the moles of Cu to grams using its molar mass:
mass of Cu = 0.0600 mol × 63.55 g/mol = 3.81 g
Therefore, the total mass of Cu produced when 1.08 grams of Al reacts completely with 9.58 grams of CuSO4 is 3.81 grams.
Explanation:
Answer:2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
Explanation:
Question 1
An animal's internal stimulus to feed in order to get the food needed for survival
An animal's internal stimulus to feed in order to get the food needed for survival is called hunger.
Hunger is a natural drive that motivates animals to search for and consume food in order to meet their nutritional needs and maintain their health and well-being.
This internal stimulus is regulated by the hypothalamus, a region of the brain that controls a variety of bodily functions, including hunger and satiety. When an animal's energy levels drop or its stomach is empty, the hypothalamus sends signals to the rest of the body to increase the desire for food.
Once the animal has eaten enough to satisfy its nutritional needs, the hypothalamus sends signals to decrease the desire for food and the animal stops eating. This process helps to ensure that animals get the nutrients they need to survive and maintain their health.
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N₂(g) + 3 H₂(g) 2 NH3(g)
What mass in grams of ammonia (NH3) would the experiment produce if Brett uses
3 moles of nitrogen gas (N₂) and an excess of hydrogen?
5.7 g NH3
O 102 g NH3
17 g NH3
51 g NH3
The experiment would produce 102.18 g of ammonia. The answer is closest to 102 g NH₃.
Steps
The balanced chemical equation for the reaction is:
N₂(g) + 3H₂(g) → 2NH₃(g)
In this equation, the stoichiometric ratio of nitrogen gas to ammonia gas is 1:2. Accordingly, 2 moles of ammonia gas are created for every 1 mole of nitrogen gas that reacts.
As a result of using 3 moles of nitrogen gas, Brett will generate 2 x 3 = 6 moles of ammonia gas.
From the equation, we can see that for every 1 mole of nitrogen gas (N₂) used, 2 moles of ammonia (NH₃) will be produced. Therefore, if 3 moles of N₂ is used, the number of moles of NH₃ produced will be:
moles of NH₃ = (3 moles N₂) x (2 moles NH₃ / 1 mole N₂) = 6 moles NH₃
To calculate the mass of NH₃ produced, we need to use its molar mass, which is 17.03 g/mol. Therefore:
mass of NH₃ = (6 moles NH₃) x (17.03 g/mol) = 102.18 g NH₃
So, the experiment would produce 102.18 g of ammonia. The answer is closest to 102 g NH₃.
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What was unknown to scientists during Wegener’s time?(1 point)
When Wegener was working, scientists were not aware of plate tectonics, the theory that explains how continents can shift.
The scientific community was not aware of the mechanism underlying the migration of the continents during the time of Wegener. Both the ideas of a solid Earth and plate tectonics had not yet gained widespread acceptance. Initially, scientists were sceptical of Wegener's idea of continental drift because they thought the Earth's surface was permanent and unchanging. The theory's development was hampered by the inability to collect and analyse data on a worldwide scale due to a lack of technology. The scientific world didn't completely embrace the idea of plate tectonics and the part it plays in sculpting the Earth's surface until decades later, with technological breakthroughs and the collection of more evidence.
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Calculate the heat change associated
with cooling a 350.0 g aluminum bar
from 70.0/C to 25.0/C. Is the change
endothermic or exothermic? Why? How to change -14,175J to -14.2kj
(-14.2 kJ)
The aluminum bar is cooling through an exothermic process, which means that heat is being released from the bar and being transported to the surroundings. This is indicated by the negative sign of the heat change.
Exothermic or endothermic change?The aluminum bar is cooling through an exothermic process, which means that heat is being released from the bar and being transported to the surroundings. This is indicated by the negative sign of the heat change (-14.2 kJ). This is due to the metal bar losing heat as it cooled down because the ultimate temperature (25.0°C) is lower than the initial temperature (70.0°C).
we can use the formula:
Q = m * c * ΔT
where Q = heat change, m = mass of the aluminum bar, c = specific heat capacity of aluminum, and ΔT = change in temperature.
The specific heat capacity of aluminum is 0.903 J/g·°C.
So, plugging in the values, we get:
Q = (350.0 g) * (0.903 J/g·°C) * (25.0°C - 70.0°C)
Q = -14,175 J
The negative sign indicates that heat is being lost by the aluminum bar,
To convert -14,175 J to kJ, we divide by 1000:
-14,175 J = -14.175 kJ
Rounding to one decimal place, we get:
-14.175 J ≈ -14.2 kJ
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A student set up a titration apparatus that involved using 25. 9 mL of 1. 57 M acetic acid. The acetic acid was titrated with 0. 154 M NaOH.
What is the pH of the titration solution after 2. 19 mL of the NaOH was added if the Ka of acetic acid is 1. 8 x 10-5?
Answer:
The PH is 2.66 of the titration solution after 2.19 ml of the naoh was added if the ka of acetic acid is 1.8 x 10-5
Explanation:
Balance the equation NH3 + O2 −→ N2 + H2O Given 3.53 mol of the reactant NH3, determine the corresponding amount of O2. Answer in units of mol.
A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.
According to this question, a reaction occured between ammonia gas and oxygen gas to produce nitrogen gas and water.
Based on the equation, 4 moles of ammonia requires 3 moles of oxygen gas to react.
This means that 3.53 moles of ammonia will require 3.53 × ¾ = 2.65 moles of oxygen gas.
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What should an investigator do when they discover a mysterious substance at a crime scene?
OA. Immediately taste it to try to identify it.
О в.
O C.
O D. Smell it to determine whether it is legal or illegal.
Conduct a presumptive drug test immediately.
Put it in a bag and properly label it with the chain of custody information.
Answer:
c) Put it in a bag and properly label it with the chain of custody information.
Step by step explanation:-
Tasting it might kill the investigator.
Drug test would not be appropriate during the crime scene.
Having the knowledge to identify the drug by smelling is quite rare in people.
Which factor is not likely to affect how quickly a person-to-person disease spreads through a group of people?
A. The color of the people's clothing. B. How much contact the people in the room have with each other. C. The contagiousness of the disease. D. Whether the people are wearing masks or not
The factor which is not likely to affect how quickly a person-to-person disease spreads through a group of people is The color of the people's clothing that is Option A.
Infectious diseases are illnesses caused by organisms like bacteria, viruses, fungus, or parasites. Numerous creatures inhabit and dwell on human body. They are usually innocuous or even beneficial. Yet, certain microbes can cause illness under particular conditions.
Certain infectious illnesses are transmissible from person to person. Some are spread by insects and other animals. You can get others by eating contaminated food or drinking polluted water, or by being exposed to organisms in the environment.
Infectious disorders are usually transmitted from person to person by the direct transmission of bacteria, viruses, or other germs. This can happen when an infected person touches, kisses, coughs, or sneezes on someone who isn't affected.
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PLS HELP LOTS OF POINTS
If given the mass in grams of both reactants in a chemical reaction, how is the limiting reactant identified?
The reactant with the higher mass in grams is the limiting reactant.
Calculate the amount of product that can be made with each reactant, then choose the reactant that produces the least amount of product.
Calculate the amount of product that can be made with each reactant, then choose the reactant that produces the most amount of product.
The reactant with the lower mass in grams is the limiting reactant.
Answer:
Explanation:
The reactant with the higher mass in grams is the limiting reactant. NO. [What counts is the numbers of molecules, not their mass. For example In the reaction of oxygen and hydrogen to form water:
2H2 + O2 = 2H2O
We need twice as many H2 molecules than O2 molecules. We need two moles of H2 and 1 mole of O2 (or anything with that 2:1 ratio). But a mole of H2 only has a mass of 2 grams, so 2 moles is 4 grams. A balanced reaction in thias case would consist of 2 grams of H2 for every 32 grams of O2. If there were only 31 grams of O2, it would be the limiting reagent, despite the fact it's mass is still greater than that of H2O]
Calculate the amount of product that can be made with each reactant, then choose the reactant that produces the least amount of product. YES [Once the reactant is consumed in producing the least amount of product, no more product will be produced, desoppite the fact that the other reactant reamins.]
Calculate the amount of product that can be made with each reactant, then choose the reactant that produces the most amount of product. NO
[This ignores the fact that the reaction stops when the other reactant is depleted.]
The reactant with the lower mass in grams is the limiting reactant. NO, for the same reasons as in 1).