The mass of 1.45 L of ether is
4.9 x 10^-7 kg
It is given that
density of ether = 0.714 g/mL
volume of ether = 1.45 L = 1450 ml
We have to find mass of 1.45 L of ether
Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol, D or ρ Density Formula ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
Density = Mass/Volume
0.714 g/mL = Mass/1450 ml
Mass = 0.00049 gram
Mass = 4.9 x 10^-7 kg
Hence, mass of 1.45 L of ether is
4.9 x 10^-7 kg
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an aqueous solution of silver fluoride, agf, contains 2.96 grams of silver fluoride and 17.6 grams of water. the percentage by mass of silver fluoride in the solution is
An aqueous solution of the silver fluoride, AgF, contains 2.96 grams of the silver fluoride and 17.6 grams of the water. The percentage by mass of silver fluoride in the solution is 14.3 %.
The mass of the silver fluoride = 2.96 g
The mass of the water = 17.6 g
The mass of the solution = mass of the AgF + mass of water
= 2.96 g + 17.6 g
= 20.56 g
The percentage by mass is expressed as :
The percentage by mass of AgF = (mass of AgF / mass of solution) ×100%
The percentage by mass of AgF = (2.96 g / 20.56 ) ×100%
The percentage by mass of AgF = 14.3 %
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when a can of coke is taken out of the fridge and warmed up to room temperature, group of answer choices there is not enough information. the entropy of the beverage will increase. the entropy of the beverage will stay the same. the entropy of the beverage will decrease.
When a can of coke is removed from the fridge and then warmed up to room temperature, the entropy of the beverage will increase.
We can define entropy as the disorderness of a system or the randomness of a particular system. The entropy of a system changes with a change in the temperature of the system.
As the temperature increases, the entropy of the system also increases and when the temperature is reduced, the entropy of the system also decreases. When a can of coke is kept in fridge, the entropy decreases as the temperature gets decreased.
As the can of the coke is taken out and warmed up to room temperature, the entropy increases with the increase in temperature as the randomness of the molecules increases.
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what is the main/most important factor that differentiates methanol, ethanol, and isopropanol from each other
The main/most important factor that differentiates methanol, ethanol, and isopropanol from each other is the the number of the carbon atoms in the molecule.
1) The methanol : The molecular formula for the compound methanol is CH₃OH. It contains number of the carbon atom is one.
2) The ethanol : The molecular formula for the compound ethanol is C₂H₆O. It contains the number of the carbon atoms is two.
3) The isopropanol : The molecular formula for the compound isopropanol is C₃H₈O. It contains the number of the carbon atom is 3.
Thus, it is clear that the main difference in these three compound is the difference in the number of the carbon atoms.
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maria is comparing the properties samples of magnesium, calcium, aluminum, and potassium. which metal is more reactive?
In the case of magnesium, calcium, aluminum, and potassium, potassium is the most reactive metal.
In general, reactivity of a metal increases as you move down a group or a column in the periodic table. The reactivity of a metal is related to the ease with which it loses electrons to form a positive ion, or cation. In the case of magnesium, calcium, aluminum, and potassium, potassium is the most reactive metal. It is located in the first group or column of the periodic table, and has the smallest atomic radius and the most loosely held outermost electrons. This makes it easier for potassium to lose electrons and form a positive ion, making it the most reactive of the four metals mentioned. Aluminum is the next most reactive, followed by calcium and magnesium. Magnesium is the least reactive of the four metals mentioned.
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a solution is made by dissolving 13.7 g of hcl in 643 ml of water. calculate the ph of the solution. (assume that the volume remains constant.)
The pH of a solution made by dissolving 13.7 g of HCl in 643 ml of water is 2.23.
The pH of a solution made by dissolving 13.7 g of hydrochloric acid (HCl) in 643 ml of water can be calculated using the following steps:
1. Calculate the molarity of the solution. This is done by dividing the amount of HCl (13.7 g) by the molar mass of HCl (36.46 g/mol), which gives us 0.376 mol of HCl. Then, divide this number by the volume of the solution (643 ml), which gives us a molarity of 0.00587 mol/L.
2. Calculate the pH of the solution. This is done by using the expression pH = -log[H+], where [H+] is the concentration of hydrogen ions in the solution. Taking the negative logarithm of 0.00587 mol/L gives us a pH of 2.23.
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what mass (in grams) of xenon tetrafluoride would be required to react completely with 1.000 g of water?
5.7g of xenon tetrafluoride would be required to react completely with 1.000 g of water.
To solve such questions, we need to find out the number of moles present for the given compunds/molecules. Balancing the equation would be our first step. The balanced equation would be :-
XeF4 + 2H2O → Xe + 4HF + O2XeF4
So, the stoichiometric ratio moles of xenon tetrafluoride and water is 1:2
Given : We have 1g of water
No. of moles of water = given weight/molar weight = 1/18 = 0.055
Let the no. of moles of xenon tetrafluoride present be x.
Balancing the ratios:-
1:2 = x:0.055
x = 0.055/2
x = 0.0275
Hence, the no. of moles of xenon tetrafluoride present is 0.0275
No. of moles = given weight/molar weight
0.0275 = required weight / 207
Hence, mass of xenon tetrafluoride = 0.0275 x 207 = 5.6925g , we can say almost 5.7g is required.
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one gram of table salt is put into an 8-oz glass, and the glass is filled with tap water. what is the concentration of salt in milligrams per liter?
When one gram of table salt is put into an 8-oz glass and the glass is filled with tap water, the concentration of salt is 4226 mg/mL.
An ounce , which is abbreviated as "oz" is a unit of measurement of weight equal to one-sixteenth of one pound.
In the United States, an ounce is the smallest and commonly used unit of measurement of weight for small items, such as pens, pencils, deodrant sticks etc., are mostly measured in ounces. In addition to this, the weight of an envelope that is used to post letters is measured in ounce. Weight of the stamps will also cover in ounces.
Here, Concentration of salt is calculated as:
= 1 g/8 oz
=1000 mg/0.236588 L
=4226 mg/L
Therefore, concentration of salt is 4226 mg/mL
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why should a chemical property of a metal be considered when building a rocket
A metal's chemical properties can affect its ability to withstand the high temperatures and pressures of a rocket launch.
How is chemistry involved in making rockets?
Chemistry is involved in making rockets in a variety of ways. The fuels used to power rockets are a mixture of flammable liquids and solid propellants, and the chemical reactions that occur when these propellants are ignited provide the thrust necessary to propel the rocket upwards. The fuels used in rocket propulsion also require precise control of their chemical composition to ensure optimal efficiency and performance. The materials used in rocket construction must be able to withstand extreme temperatures and pressures, and the use of various chemical treatments and coatings helps to achieve this. Finally, the development of new rocket fuels and other materials used in rocket construction requires extensive research and development in the field of chemistry.
Metals with higher melting points and corrosion resistance are more suitable for use in rocket construction as they will be able to withstand the harsh environment of a launch. Additionally, certain metals may be more reactive than others and can produce dangerous byproducts when exposed to extreme temperatures. Therefore, understanding the chemical properties of the metal being used can help ensure the rocket is able to withstand the launch and not cause any safety hazards.
Therefore, to withstand the high temperatures and pressures of a rocket launch chemical property of a metal is used.
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When 0. 55 grams of magnesium reacts with nitrogen, a chemical reaction occurs. The product of the reaction weights 0. 76 grams. Calculate the empirical formula of the compound containing Mg and N
The empirical formula of the compound containing Mg and N is Mg₃N₂.
The outcome of the Mg + N2 reaction is:
Mg + N₂ → MgₓNₙ
the following are contained in 0.55g of magnesium:
Mg is represented as 0.55g x (1 mol / 24.305g) = 0.0226 moles.
Due to the product's 0.76g mass, the mass of nitrogen is as follows:
0.76g minus 0.55g equals 0.21g of nitrogen.
0.015 moles of N are equal to 0.21g x (1 mol / 14g).
The ratio of N:Mg in moles is:
0.0226 / 0.015 = 1.5. This indicates that you have 1.5 Mg atoms for every N atom. The problem's empirical formula, which is the simplest whole-number ratio of atoms in a compound, is:Mg₃N₂
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The reaction 2N2O5→2N2O4+O2 takes place at around room temperature in solvents such as CCl4. The specific rate constant at 293 K is found to be 2. 35×10−4s−1 and at 303 K the specific rate constant is found to be 9. 15×10−4s−1
the reaction's 2N2O5→2N2O4+O2 frequency factor at 303 K is A = 9.15 x 10^-4 s^-1 *
The specific rate constant (k) of a first-order reaction is given by the equation:
k = A*e^(-Ea/RT)
Where A is the frequency factor, Ea is the activation energy, R is the gas constant and T is the temperature in Kelvin.
Substituting for A:
A = k*e^(Ea/RT)
We know that the specific rate constant at 303 K is 9.15 x 10^-4 s^-1, and we can assume that the activation energy (Ea) and gas constant (R) are constant.
T = 303 K
Plugging in the known values we get
A = 9.15 x 10^-4 s^-1 * e^(Ea/R*303)
The frequency factor, A, is a measure of the number of collisions of reactant molecules per unit of time that have sufficient energy to overcome the activation energy barrier and form products. The value of A can be used to compare the relative rates of different reactions. The fact that the specific rate constant at 293 K is 2.35 x 10^-4 s^-1 and at 303 K is 9.15 x 10^-4 s^-1, indicates that the reaction rate increases with increasing temperature. This is consistent with the expected behavior of a first-order reaction, as an increase in temperature will increase the kinetic energy of the reactant molecules, making them more likely to collide with each other and form products.
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Search for the complete question is :
In solvents like CCl4, the reaction 2N2O52N2O4+O2 occurs at or near room temperature. At 293 K, the particular rate constant is discovered to be 2.35 104 s1, while at 303 K, it is discovered to be 9.15 104 s1. Determine the reaction's frequency factor at 303 K.
According to Figure 2, the maximum positive value of
Vs was approximately:
A. 125 V.
B. 200 V.
C. 250 V.
D. 275 V.
According to Figure 2, the maximum positive value of Vs was approximately: 250 V.figure was attached below.Vs means valence.
The power supply voltage, Vs, and the circuit current, I, are monitored throughout a 20 msec time span in Figure 2. The dashed line denotes the voltage Vs. We must identify the peak or crest of the dashed curve in order to get the highest positive value of Vs. This highest point on the graph corresponds to either 0.25 amps or 250 volts.Maximum elemental valence. The data from the list of the elements' oxidation states is used to calculate the elements' maximum valences. Maximum positive acceleration occurs when the slope of the velocity-time curve is greatest, at t=3s, and is around (6m/s-2m/s)/(4s2s)=2m/s 2 (the slope of the graph). (c) When the slope of the velocity-time graph is zero, which happens at t=6s and also for t>10s, the acceleration a=0.
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a solution is prepared at that is initially in dimethylamine , a weak base with , and in dimethylammonium bromide . calculate the ph of the solution. round your answer to decimal places.
At this location, a solution is made up of dimethylamine, a weak base, and dimethylammonium bromide. The solution's pH value is 10.96.
Describe base.a material that can neutralize acids and receive hydrogen ions from water. Bases can color certain colours blue and feel sloppy or soapy upon that skin. Sodium hydroxide is a good illustration of a base.
Which base has the most strength?Because it totally dissociates into sodium ions as well as hydroxide ions, hydrogen peroxide is the strongest base. Further away from the acid, these strong acids are treated with hydronium ions, totally ionizing the hydrogen ions.
pOH = pKb + log [acid]/[base]
pOH = -log 1.3 × 10⁻³ + log 0.20 M/0.14 M
pOH = 3.04
pH of the solution,
pH + pOH = 14
pH = 14 - pOH
= 14 -3.04
= 10.96
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answer the following question by entering the numeric value with appropriate units. when entering units, capitalization is important. for example, m is the symbol for meter and m is the symbol for molarity. if the length of one side of a square is 12.0 m , what is the perimeter of the square?
f the length of one side of a square is 12.0 m, the perimeter of the square is 48.0 m
To calculate the perimeter of a square, you need to add up all four sides of the square. The formula for the perimeter of a square is P = 4s where s is the length of one side of the square.
Given that one side of the square is 12.0 m, we can plug this value into the formula to find the perimeter.
P = 4s = 4(12.0 m) = 48.0 m
So, the perimeter of the square is 48.0 m
Perimeter is the measure of the distance around the outside of a two-dimensional shape, such as a square, rectangle, triangle, or circle. It is the sum of the lengths of all the sides of the shape. It is used to measure the size or the extent of a shape and is usually measured in units such as meters, centimeters, inches, or feet.
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Describe how detergents (e. G. Washing powder) are able to
remove greasy stains from our clothes.
The water in Gothenburg is "soft". What is meant by soft water and why do we need
to use less detergent in soft water areas and more detergent in hard water areas.
Detergents, such as washing powder, are able to remove greasy stains from clothes by breaking down the grease into smaller, more manageable particles.
Detergents contain molecules with a hydrophobic (water-repelling) end and a hydrophilic (water-attracting) end. When added to water, the hydrophobic ends of the detergent molecules attach to the grease and oil on the clothes, while the hydrophilic ends remain in the water. This causes the grease and oil to be pulled away from the clothes and suspended in the water, making them easier to wash away.
Water is considered "soft" when it contains low levels of dissolved minerals such as calcium and magnesium. Hard water contains high levels of these minerals, which can cause buildup on fixtures and appliances over time. When using detergents in hard water, the minerals in the water can interfere with the detergent's ability to lather and clean effectively, which means that more detergent is needed to achieve the same results. In contrast, soft water does not have this issue and less detergent is needed to achieve the same cleaning power.
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Which statement describes energy in a nuclear reaction?
- energy is destroyed as the nucleus of an atom breaks down
- energy is released from the nucleus of an atom
- energy is created from the nucleus of the atom
- nuclear reactions absorb energy, but do not release energy
"energy is created from the nucleus of the atom" describes energy in a nuclear reaction.
What is nuclear reaction?Nuclear reaction, a change in the identity or properties of an atomic nucleus caused by the bombardment of an energetic particle. The particle that is bombarding may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion. Nuclear reactions are collisions between two atomic nuclei or one atomic nucleus and a subatomic particle that produce one or more nuclides. Nuclear reactions produce nuclides that are distinct from the reacting nuclei (commonly referred to as the parent nuclei).
Here,
The phrase "energy is created from the nucleus of the atom" describes the generation of energy in a nuclear reaction.
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Dr. Fowler is studying two groups of rats. Group A lives outdoors and Group B lives indoors. Dr. Fowler observes that the outdoor group seems to learn more quickly, a trait she believes is due to genetic differences between the two groups of rats. How should Dr. Fowler test her hypothesis in order to rule out another likely alternative?
Dr. Fowler tests her hypothesis in order to rule out another likely alternative through the fact that it evaluates the key vulnerabilities to climate change, and assesses aggregate damage levels and the role of multiple stresses.
What is a Hypothesis?A hypothesis may be defined as a testable statement about the relationship between two or more variables or a proposed explanation for some observed phenomenon.
According to the context of this question, if the rats of Group A live outdoors, it seems to learn more quickly. This is because of the presence of a specific trait. This trait is due to genetic differences between the two groups of rats which governs the specific phenotypic expression in the overall presence of genes or alleles.
Therefore, the fact that it evaluates the key vulnerabilities to climate change, and assesses aggregate damage levels and the role of multiple stresses.
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what significance does the slight overlap of the van der waals surfaces have with respect to the structural relationships of the catalytic triad residues?
The slight overlap of the Van der Waals surfaces between the catalytic triad residues is important for the structural relationships of the residues, allowing for proper positioning and orientation. It also helps to stabilize the transition state of the enzyme-catalyzed reaction which is crucial for the catalytic activity of the enzyme
The slight overlap of the Van der Waals surfaces is also known as the Van der Waals interaction. It is important for the structural relationships of the catalytic triad residues in enzymes.
Enzymes are biological catalysts that speed up chemical reactions in cells. A common feature of enzymes is the presence of a catalytic triad, which is a group of three amino acid residues that are critical for the enzyme's catalytic activity. The catalytic triad residues are typically composed of a nucleophile, a base, and an acid/proton acceptor.
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Titanium oxide is often added to food to color it white. If a jelly bean contains approximately 7. 69x10 18 formula units of TiO2, how many moles of TiO2 are in a jelly bean?
0.0000128 mole TiO2 in a jelly bean.Any chemical molecule, whether created chemically or naturally, that exclusively contains the elements titanium and oxygen is referred to as titanium oxide.
With the chemical formula TiO2, titanium dioxide, sometimes referred to as titanium(IV) oxide, is an inorganic substance. It is also known as titanium white, Pigment White 6 (PW6), or CI 77891 when used as a pigment.
Step 1: Given data
Number of moles of titanium (IV) oxide in 1 jelly bean (n):7. 69x10^( 18)
Step 2: Calculate the mass (in grams) corresponding to 7. 69x10^( 18) moles of TiO₂
To convert moles to mass, we need a conversion factor. In this case, it is the molar mass of TiO₂: 79.87 g/mol.
7. 69x10^( 18) mol TiO₂ × 79.87 g TiO₂/1 mol TiO₂
= 1.64*10^(20)g TiO₂
when mass is reversely converted to moles then the moles:0.0000128 mole TiO2.
Although mineral forms might seem black, it is a solid that is insoluble in water and is white in colour. It may be used as a pigment in a variety of products, such as paint, sunscreen, and food colouring. Its E number for usage as food colouring is E171.
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8. The noble gas neon is used for filling neon signs. Like other noble elements, it has a full
octet (complete outer energy level) of electrons, which makes the gas
a. Freeze at
room temperature
b. React with other gases in the air
c. Unlikely to combine/react with other elements
d. Solidify at standard pressure and temperature
Noble gases are chemical elements with eight valence electrons and as such have a full octet. Some examples are argon, neon, etc. Hence, the full octet makes the gas (neon) unlikely to combine with other elements.
The class of substances known as noble gases also includes neon, helium, argon, krypton, and xenon. These elements have entire valence shells, making them the most stable and least reactive (the outer shell has the max number of electrons, two for helium, eight for the rest). The reason NOBLE gases are so named is because, like the nobility, they are inert. Because they are practically unheard of on Earth, you may also refer to them as rare gases. One exception to this rule is argon, which we breathe in as 1% of every breath even though it has no impact on our bodies whatsoever.
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a reaction occurs when nitric acid (hno3) is mixed with an aqueous solution of potassium hydrogen carbonate. aqueous potassium nitrate is produced. write the chemical and net ionic equations for the reaction.
The net ionic equation for the reaction is:
H+(aq) + CO3^2-(aq) → NO3^-(aq) + H2O(l) + CO2(g)
What is the property of the given reaction?The given reaction is acid-base neutralization, where HNO3 (nitric acid) acts as the acid, and KHCO3 (potassium hydrogen carbonate) acts as the base. The H+ ion from HNO3 reacts with the CO3^2- ion from KHCO3 to form H2O (water) and CO2 (carbon dioxide) as products. The remaining ions combine to form KNO3 (potassium nitrate) as the main product.
What is KHCO3?KHCO3 is Potassium bicarbonate. It is a white, crystalline, slightly alkaline and salty substance. It is created by the passage of carbon dioxide through an aqueous potassium carbonate solution. It is used in medicine as an antacid.
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a kilocalorie, by definition, is a measure of a. fat in food. b. heat energy. c. nutrients in food. d. sugar and fat in food.
One kilogram of water requires one kilocalorie of heat energy to increase its temperature by one degree F.
Is 37 degrees Fahrenheit hot or cold?Your body temperature is usually around 37 °C. You frequently get a fever when your body is 37.8°C or higher. You can feel unsteady, sweaty, or chilly. You can tell whether you have a fever by taking your temperature using a thermometer.
Is Australia hotter than India?Is India hotter than Australia? India is anticipated to be hotter since it is closer to the equator than Australia. Most of India's interior regions see average temps between 90 and 104 °F. In contrast, Australia's summertime average temperature is 86 °F.
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What mass of oxygen combines with 1.14 mol of magnesium in the reaction
2 Mg(s) + O2(g) → 2 MgO(s)?
Taking into account the reaction stoichiometry, a mass of 18.24 grams of O₂ combines with 1.14 mol of magnesium.
Reaction stoichiometryThe balanced reaction is:
2 Mg + O₂ → 2 MgO
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
Mg: 2 molesO₂: 1 moleMgO: 2 molesThe molar mass of the compounds is:
Mg: 24.31 g/moleO₂: 32 g/moleMgO: 40.31 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Mg: 2 moles ×24.31 g/mole= 48.62 gramsO₂: 1 mole ×32 g/mole= 32 gramsMgO: 2 moles ×40.31 g/mole= 80.62 gramsMass of O₂ requiredThe following rule of three can be applied: If by reaction stoichiometry 2 moles of Mg react with 32 grams of O₂, 1.14 moles of Mg react with how much mass of O₂?
mass of O₂= (1.14 moles of Mg× 32 grams of O₂)÷2 moles of Mg
mass of O₂= 18.24 grams
Finally, a mass of 18.24 grams of O₂ is needed.
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what is the volume flow rate in ml/s as the trigger is being squeezed? express your answer in milliliters per second.
The volume flow rate in ml/s will depend on the size and design of the trigger, and thus cannot be accurately determined without more information.
What is the volume flow rate in ml/s as the trigger is being squeezed?The volume flow rate in milliliters per second (ml/s) is the amount of liquid that flows through the dispenser in a given amount of time as the trigger is being squeezed. This rate can be affected by several factors, including the pressure applied when squeezing the trigger, the size of the opening in the nozzle, and the viscosity of the liquid being dispensed. To determine the volume flow rate, it is important to measure the amount of liquid that is dispensed in a certain amount of time. This can be done by determining the amount of liquid that is dispensed in a given period of time (e.g. one second) and then multiplying this by the total number of seconds in the period that the trigger was squeezed. In summary, the volume flow rate in milliliters per second (ml/s) is the amount of liquid that flows through the dispenser in a given amount of time as the trigger is being squeezed. To calculate the volume flow rate, it is important to measure the amount of liquid that is dispensed in a given period of time and then multiply this by the total number of seconds in the period that the trigger was squeezed. Factors such as the pressure applied when squeezing the trigger, the size of the nozzle, and the viscosity of the liquid being dispensed can also affect the volume flow rate.To learn more about The volume flow rate refer to:
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Analyze the following proton nmr spectrum for a compound with the chemical structure c10h12o2. Draw the structure of the compound
Guaiacol, a pale yellow oily liquid that is the allylic replacement for eugenol(C10H12O2 ), is a liquid. Its aroma is pleasant, spicy, and reminiscent of cloves. It is one of the most significant substances found in cloves.
The compound eugenol (4-allyl-2-methoxyphenol) has anti-inflammatory, antiseptic, and antibacterial effects. One of the reduced phenylpropanoids and a key ingredient in clove oil is eugenol.C10H12O2 -> 5 unsaturation sites. For a molecule of this size (i.e., only 10 carbons), the presence of a phenyl ring is often responsible for the high number of unsaturation sites (which provides 4sites on its own). Look for signals in the 7-8 ppm (aromatic proton) range in the 1H nmr spectrum for an immediate demonstration..
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Which of the following shows an unsaturated fatty acid?
Unsaturated fatty acids are the first option (A).
What is fatty acids ?A fat or fatty acid that contains one or more double bonds in the fatty acid chain is referred to be an unsaturated fat.If a fat molecule has just one double bond, it is considered monounsaturated; if it has multiple double bonds, it is considered polyunsaturated. The unsaturated fat (A) in this instance is polyunsaturated.Fruits, vegetable oils, seeds, nuts, animal fats, and fish oils are fatty acid sources. Omega-3 fatty acids are among the essential fatty acids that play a crucial role in cellular processes. The body lacks a biochemical route to manufacture these compounds on its own, hence they are a necessity of the human diet.To Learn more About fatty acids Refer To:
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5. Calculate the number of molecules in 360g of glucose.
what is the freezing point (in degrees celcius) of 4.23 kg of water if it contains 232.8 g of c a b r 2 ? the freezing point depression constant for water is 1.86 oc/m and the molar mass of c a b r 2 is 199.89 g/mol.
The freezing point of solution is -1.53°C.
When a solute is added to the original solvent, the freezing point decreases. The freezing point depression formula is:
ΔT = kf×m×i
Where i is the Van't Hoff factor, m is the molality of the solution (moles CaBr2 -solute- / kilogram water -solvent), and Kf is the freezing point depression constant of the solvent (1.86°C/m).
Molality of the solution is:
-moles CaBr₂ (Molar mass:
232.8g ₓ (1mol / 199.89g) = 1.16 moles
Molality is:
1.16 moles CaBr₂ / 4.23kg water = 0.274m
The amount of solute produced after one mole of solid solute dissolves is represented by the Van't Hoff factor, for CaBr₂:
CaBr₂(s) → Ca²⁺ + 2Br⁻
When 1 mole of a solid solute is converted into 3 moles of ions, the Van't Hoff factor is 3.
Putting:
ΔT = kf×m×i
ΔT = 1.86°C/m×0.274m×3
ΔT = 1.53°C
The freezing point of water decreases in 1.53°C. As freezing point of water is 0°C, the freezing point of the solution is -1.53°C.
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4.aqueous solutions of hydrogen peroxide sold in pharmacies are usually approximately 3% h202 by mass. however, in solution, hydrogen peroxide decomposes into water and oxygen. what is the percent by mass of a solution of hydrogen peroxide, h2o2, prepare from 1.423 g of h202 which is titrated with 40.22 ml of 0.01143 mol/l kmno4(aq). the reaction occurs in an acidified solution (ans:2.747%) (hint: find mass of h202 actually present, then mass %) balanced equation: (aq) 502(9) 8h200 5h2o2(aq) 2mno4 (aq) 6h (aq) 2mn?
The percent by mass of the solution of H2O2 is 1.6547%, when hydrogen peroxide decomposes into water and oxygen.
How to calculate percent by mass of the solution?
To find the percent by mass of a solution of hydrogen peroxide (H2O2) prepared from 1.423 g of H2O2 that is titrated with 40.22 mL of 0.01143 M KMnO4(aq), you will need to determine the mass of H2O2 that is actually present in the solution.
The balanced equation for the reaction is:
2KMnO4(aq) + 3H2O2(aq) + 8H+(aq) --> 2MnO2(s) + 5O2(g) + 8H2O(l)
From the equation, we know that for every 2 moles of KMnO4(aq), 3 moles of H2O2(aq) are consumed. Therefore, the number of moles of H2O2 that are actually present in the solution can be determined by multiplying the moles of KMnO4 consumed by 3/2.
The moles of KMnO4 consumed can be determined by multiplying the volume of KMnO4 used by its concentration in mol/L.
So the moles of KMnO4 = 40.22 mL x 0.01143 mol/L = 0.459 mol
The moles of H2O2 present = (3/2) x 0.459 mol = 0.6885 mol
The mass of H2O2 present = 0.6885 mol x 34.02 g/mol = 23.55 g
Therefore, the percent by mass of the solution of H2O2 is (23.55 g / 1.423 g) x 100 = 1.6547 %
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Which of the following are functions of the stomach?
Answer:
1-Temporarily store food.
2-Contract and relax to mix and break down food.
3-Produce enzymes and other specialized cells to digest food
Water has the chemical formula H2O. How do the properties of hydrogen (H) and oxygen (O) change when they come together to form water? They gain the ability to become a liquid when they form a water molecule They will both lose electrons when they become part of a water molecule They will no longer burn with they are part of a water molecule They both can become a gas once they combine to form a water molecule
The oxidation-reduction (redox) process that occurs when hydrogen and oxygen combine to generate water is a type of chemical reaction. It is true that when hydrogen and oxygen .
combine to create a water molecule, they acquire the capacity to turn into liquids, although at normal temperature and pressure, hydrogen and oxygen are gases.The oxidation-reduction (redox) process that occurs when hydrogen and oxygen combine to generate water is a type of chemical reaction. It is true that when hydrogen and oxygen . It is true that when they combine to create a water molecule, oxygen and hydrogen both lose electrons. Hydrogen loses one electron while oxygen obtains two electrons. This is also true; hydrogen and oxygen are extremely combustible gases, but when they combine to create a water molecule, they become inflammable and will no longer burn.
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