Based on the given information, B: Ethanol is the compound that has the strongest intermolecular forces.
Intermolecular forces (IMF) are the forces that hold molecules of a substance together. The strength of IMF is directly related to the boiling point of a substance. So, the stronger the IMF, the higher the boiling point will be.
The information provides the heat of vaporization (DHvap) for each substance, which is the energy required to convert a liquid into a gas. The higher the DHvap value, the stronger the IMF because more energy is required to overcome the forces that hold the molecules together.
When comparing the DHvap values, we can see that Ethanol (C2H5OH) has the highest DHvap value of 39.3 kJ/mol, followed by water (H2O) with 40.8 kJ/mol. This means that ethanol has stronger intermolecular forces than water, that's why ethanol has a higher boiling point than water.
Therefore, based on the DHvap values, Ethanol has the strongest intermolecular forces.
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using the mass of kbr that you calculated on the previous slide, write a procedure for preparing 100ml of a 1.5m kbr solution. include specific quantities of all substances and describe any equipment that you would need to make this solution.
The procedure for preparing 100ml of a 1.5m kbr solution ,
1. Weigh exactly 17.85 g of KBr in a clean and dry 100 mL beaker.
2. Dissolve this salt in a minimum amount of distilled water (approximately 10-20 mL).
3. Transfer this diluted solution in a clean and dry 100 mL volumetric flask.
4. Dilute this solution up to the mark using distilled water.
5. This is 1.5 M KBr solution. Ready for use.
KBr refers to potassium bromide . In reality, potassium bromide (KBr) is a chemical substance. One of the common anticonvulsant medications used to treat canine and feline epilepsy is potassium bromide, sometimes known as KBr. This can be taken on its own or in conjunction with phenobarbital to control seizure activity. The odourless potassium bromide salt is a white crystalline powder, colourless crystals, or a white granular solid with a strong bitter flavour .
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the same net ionic process takes place when any strong acid reacts with any strong base. write the equation for that process
the same net ionic process takes place when any strong acid reacts with any strong base. When a strong acid reacts with a strong base, the net ionic equation for the process is:
H+ (aq) + OH- (aq) → H2O (l)
This reaction is known as a neutralization reaction, and it is characterized by the neutralization of the strong acid and base by forming water and a salt. In this equation, the acid (H+) donates a proton to the base (OH-), forming water (H2O) and a salt. The acid and base are said to be neutralized, and the resulting solution is neutral (neither acidic nor basic). This type of reaction is common in many chemical reactions and is often used in the laboratory to neutralize solutions and to titrate acids and bases.
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naturally occuring element x exists in three isotopic forms: x-28 (27.343 amu, 67.14% abundance), x-29 (28.889 amu, 10.50% abundance), and x-32 (31.993 amu, 22.36% abundance). calculate the average atomic weight of x. please enter your answer to 4 significant figures.
The naturally occurring the element x exists in three isotopic forms. The average atomic weight of x 28.544 amu.
Given that :
x- 28, Abundance % = 67.14 % = 0.6714
The atomic mass = 27.343 amu
x-29, Abundance % = 10.50 % = 0.1050
The atomic mass = 28.889 amu
x- 32, Abundance % = 22.36 % = 0.2236
The atomic mass = 31.993 amu
The average atomic weight = ( 27.343 × 0.6714 ) + ( 28.889 × 0.1050) +
( 31.993 × 0.2236)
= 18.358 + 3.0333 + 7.153
= 28.544 amu
Thus, the average atomic weight of naturally occurring element x exists in three isotopic forms 28.544 amu.
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HELP PLS I NEED ANSWER NOW PLS :[ Which substances are released during cellular respiration? Use complete sentences to explain how the mass of oxygen is conserved during cellular respiration.
HELP PLEASE BOND ENTHALPY WORKSHEET
what is the rate of diffusion for ammonia
In comparison to hydrogen chloride, ammonia diffuses 1.46 times more quickly.
Is the diffusion of ammonia quick?Since hydrogen chloride has a higher molecular weight than ammonia, the hydrogen chloride will diffuse more slowly and cover a longer distance inside the tube.In comparison to hydrogen chloride, ammonia diffuses 1.46 times more quickly.NH3 diffuses at a faster rate because it has a smaller molecular mass than the other gases mentioned. Graham's law of gas diffusion states that this is the case.To get the diffusion rate of a certain gas, divide the diffusion rate of the original gas by the square root of the molar mass of gas 2, then divide that by the molar mass of gas 1.To learn more about ammonia diffuses refer to:
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Three of the primary components of air are carbon dioxide, nitrogen and oxygen in a sample containing a mixture of these gases at two atmosphere of pressure, with a partial pressure of : PCO2 = 30.185 mmHg, PN2 = 1009.525 mmHg. What is the partial pressure of oxygen?
The partial pressure of oxygen would be 0.63198 atm or 480.3047 mmHg.
Law of partial pressureAccording to Dalton's law of partial pressure, the pressure of a gas consisting of a mixture of gases is the sum of the partial pressure of individual gases in the mixture. This law is mathematically expressed as:
[tex]P_{total[/tex] = [tex]P_1 + P_2 + .....[/tex]
In this case, [tex]P_{total[/tex] = 2 atm, PCO2 = 30.185 mmHg, and PN2 = 1009.525 mmHg
1 mmHg = 0.00131579 atm
30.185 mmHg = 0.03972 atm
1009.525 mmHG = 1.3283 atm
Thus, PO2 = Ptotal - PCO2 - PN2
= 2 - 0.03972 - 1.3283
= 0.63198 atm
0.63198 atm = 480.3047 mmHg
In other words, the partial pressure of oxygen in the gas mixture would be 0.63198 atm or 480.3047 mmHg.
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A closed container is filled with oxygen. The pressure in the container is 355 kPa What is the pressure in
millimeters of mercury?
which statement supports the main ideas of the law of conservation of mass? responses the reactants in a chemical reaction are the same as the products. the reactants in a chemical reaction are the same as the products. the masses of the reactants are less than the masses of the products. the masses of the reactants are less than the masses of the products. the masses of the reactants are equal to the masses of the products. the masses of the reactants are equal to the masses of the products. the masses of the reactants are greater than the masses of the products.
Answer:
the first statement is correct...
it only supports the main idea of the law of conservation of mass...
hope I can help you...
one half cell of an electrochemical cell is made by placing a strip of pure zinc in 500 milliliters of 0.10 molar zncl2 solution. the other half cell is made by placing a strip of pure copper in 500 milliliters of 0.010 molar cu(no3)2 solution. would the initial concentration be lesser than, greater than or equal to the voltage under standard conditions?
The initial voltage of the electrochemical cell would be less than the voltage under standard conditions.
An electrochemical cell is a device that converts chemical energy into electrical energy, or vice versa, through a redox reaction. The voltage of an electrochemical cell can be determined by measuring the potential difference between the two half-cells that make up the cell. The voltage of an electrochemical cell is determined by the half-cell potentials and the concentration of the ions in the solutions. The half-cell potential of a metal is the potential of a metal electrode in a solution of its ions at standard conditions, which is defined as a concentration of 1 M and a temperature of 25°C. In the case of zinc, the half-cell potential is -0.76 V, and for copper, the half-cell potential is +0.34 V. In the given cell, one half-cell is made of a strip of pure zinc in 500 milliliters of 0.10 M ZnCl2 solution, and the other half-cell is made of a strip of pure copper in 500 milliliters of 0.010 M Cu(NO3)2 solution. The concentration of the ions in the solutions is not at the standard concentration of 1 M, which means that the voltage of the cell will be different from the standard voltage. A deviation from the standard concentration results in a deviation from the standard potential, with a lower concentration leading to a lower potential. Therefore, the initial voltage of the electrochemical cell would be less than the voltage under standard conditions because the concentrations of the ions in the solutions are not at the standard concentration of 1 M.
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which is the correct molar mass for the compound cabr2?
199.86 0r 200g/mol molar mass for the compound cabr2
The orbitals or shells that enclose an atom's nucleus are home to electrons. In the nucleus, protons and neutrons are present. In the atom's nucleus, they coalesce. An atom's nucleus is surrounded by electrons in distinct orbits. The molar mass is calculated by dividing the mass (g) of a certain chemical element or chemical compound by the amount of the substance (mol). The standard atomic masses (in g/mol) of the component atoms can be added to determine the molar mass of a compound.
Thus, the molar mass of CaBr2 can be calculated as shown below.
Molar mass=(1×40.078gmol+(2×79.904gmol)
=40.078gmol+159.808gmol
=199.886gmol
Hence, the molar mass of CaBr2 is 199.886gmol.
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Changing between what two energy levels would release the biggest quantum of energy?
When the atom, or system, emits or absorbs energy, a transition between two energy levels is said to take place. A system's ground state is the lowest energy level, and excited states have higher energy levels.
Only specific discrete values of energy, known as energy levels, can be absorbed by a bound or spatially constrained quantum mechanical system or particle. Unlike classical particles, which can have any amount of energy as well as excited and ground states, Electrons may be found at specific intervals from an atom's nucleus known as energy levels, also referred to as electron shells. In essence, this means that nuclear power facilities operate at full capacity for more than 92% of the year. This is approximately roughly two times more than natural gas and coal units, and approximately three times as reliable as wind and solar facilities.
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does the atomic mass change? why? why not? if it does what is it or what are the variations of it? in an hydrogen ion
Atomic mass of elements can change. The elements with same atomic number, but have different atomic mass or mass number is called an isotopes.
Atomic number of an element does not change. However variations in their atomic masses can happen. Atomic mass is the sum of protons and neutrons in the nucleus. Number of protons does not change, but number of neutrons can vary and such element occur in nature or can be laboratory made and are called isotopes.
There are 3 isotopes for hydrogen. Protium has an atomic number of 1 mass mass number 1 (meaning only one proton in the nucleus and no neutrons). Deuterium have an atomic number 1 and atomic mass 2 ( 1 proton and 2 neutrons). Tritium with atomic number 1 and atomic mass 3( 1 proton and 2 neutrons).
₁H¹ ₁H² ₁H³
Protium Deuterium Tritium
So atomic mass can vary in elements.
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A puddle of liquid ammonia is evaporating. What mass of the ammonia evaporates as it absorbs 8. 2 kilo joules of energy? Pls help
24g of mass of the ammonia evaporates as it absorbs 8. 2 kilo joules of energy.
q = m .ΔHf
[tex]8.2KJ=m(399)\frac{J}{g}\\\frac {8.2*10^{3} J}{339\frac{J}{g}}=m\\0.024*10^{3}g=m\\24g=m[/tex]
With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colourless gas with a strong, pungent odour.When molecules on a liquid's surface escape into the vapour phase, evaporation takes place. When clusters of liquid molecules erupt into vapour bubbles, boiling happens within the liquid's bulk rather than at its surface. Below, at, and above their boiling points, all liquids will evaporate.It contributes considerably to the nutritional demands of terrestrial creatures by serving as a precursor to 45% of the world's food and fertilisers. Biologically, it is a frequent nitrogenous waste, especially among aquatic animals.
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lithium reacts spontaneously with bromine to produce lithium bromide. if 25.0 g of lithum and 25.0 g of bromine are present at the beginning of the reaction how much of each substance are present when the reaction is complete
The balanced equation for the reaction of lithium and bromine to produce lithium bromide is:
Li + Br2 → LiBr
The total mass of the reactants and products must be equal in order for the rule of conservation of mass to apply. As a result, we can determine the mass of the other reactant and product if we know the mass of one reactant and one product.
In this instance, we are aware that the initial concentrations of the reactants are 25.0 g of lithium and 25.0 g of bromine. Lithium has a molar mass of 6.939 g/mol, while bromine has a molar mass of 159.808 g/mol. So that we may convert each substance's mass to a unit of moles:
Li: 25.0 g / 6.939 g/mol = 3.6 moles
Br2: 25.0 g / 159.808 g/mol = 0.156 moles
We can then convert the moles back to grams using the molar mass of each substance:
Li: 3.6 moles x 6.939 g/mol = 24.96 g
LiBr: 3.6 moles x (6.939 g/mol + 159.808 g/mol) = 627.38 g
Br2: 0.156 moles x 159.808 g/mol = 24.96 g
So, when the reaction is complete, we have 24.96 g of lithium, 24.96 g of bromine, and 627.38 g of lithium bromide.
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elect all the statements that correctly describe resonance structures.multiple select question.resonance structures differ only in the arrangement of electrons, not the atoms.an individual resonance structure does not accurately represent the structure of the species.resonance structures are isomers of the same species.resonance forms rapidly interconvert and the species could have any one of these structures at any time.individual resonance forms are not real.
All the statements given above are correct.
Atoms within resonance structures are the same. The species' structure is not accurately reflected by a single resonance structure.
What are resonance structures?A representation of a molecule or an ion called a resonance structure depicts several electron combinations that are not conceivable in a single, static structure.
Resonance hybrid refers to the actual structure of the molecule or ion, which is an average of the potential resonance structures.
Resonance structures are not different in terms of atoms, but rather in the arrangement of electrons.
Resonance structures vary, and no single resonance structure can fully capture the structure of an entire species.
The species that make up resonance structures have isomers.
The species could have any of these structures at any time since resonance forms quickly interconvert.
It is not real to have individual resonance shapes.
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A gas occupies a volume of 14. 5 L at 230 K. What will the temperature be it the gas
expands to 21. 8 L?
345. 8 K
1. 37 K
O 17. 4 K
1530K
A gas occupies a volume of 14. 5 L at 230 K. Option (C), 17.4 K will the temperature be it the gas expands to 21.8 L.
The relationship between the temperature, volume, and pressure of a gas is described by the ideal gas law, PV = nRT, where P is the pressure, V is the volume. We are given the initial volume and temperature of the gas and we are asked to find the final temperature when the gas expands to a different volume. The ideal gas law is an equation of state of a gas, which describes the relationship between the pressure, volume, and temperature of a gas. We are given V1, T1, and V2. The number of moles and pressure are not given so we can consider them constants.
The equation is :
V1/T1 = V2/T2
T2 = T1(V1/V2)
T2 = 230 K (14.5L / 21.8L) = 17.4 K
So the temperature will be 17.4 K if the gas expands to 21.8L.
Therefore, the correct answer is 17.4 K (Option C).
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What is the relationship between a chromosome and DNA?
Responses
Chromosomes manufacture DNA.
Chromosomes are made of DNA.
DNA is made of chromosomes.
DNA manufactures chromosomes.
Answer:
I think it is b chromosomes are made of DNA. I'm not for sure tho sorry
what is chemistry and reasons for studying chemistry
The study of basic properties and behavior of matter is known as chemistry. It is a branch of natural science that studies everything from the atoms, molecules, and ions that make up a compound to the elements that make up matter:their composition,structure,characteristics, behavior, and what happpens when they interact.
Cooking is essentially a chemistry experiment. It's likely that you'll become a better cook if you comprehend the chemical processes involved in raising baked items, neutralizing acidity, or thickening sauces. Information on petroleum, product recalls, pollution, the environment, and technological advancements.
Your understanding of the world around you is aided by chemistry. Environmental contamination is without a doubt a major issue on a global scale. But how does it impact Earthly life? Basic chemical knowledge is necessary to comprehend how environmental contamination affects both living things and the atmosphere.
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Two electrons grouped together on an electron shell are called...
A. electron sets.
B. electron pairs.
C. Valence electrons
a group electrons is called electon pair.
Answer:
B. electron pairs.
Explanation:
Use the figure to answer the questions name a pair of complementary angles 
Complementary angles are two angles whose sum is 90 degrees.
How do you write a pair of complementary angles?If the total of two angles is 90 degrees, they are said to be complimentary. Angle supplement is defined as (180 - x)°. (90 - x)° is the angle's complement.Each angle is the complement of the one before it. Similar to supplementary angles, these are the angles that add up to 180 degrees.A complimentary pair of colours is one such combination of hues. Fig. 1.7 also has other examples of complimentary pairs, such as red with cyan, violet with yellowish green, green with magenta, purple, or red, depending on the specific shade of green, and so forth.There are five basic relationships between angle pairs in geometry: complementary, supplementary, adjacent, linear, and vertical.To learn more about angles refer to:
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How many grams of water can be formed from 192 grams of oxygen gas?
The mass of the water that is formed by the oxygen is 216 g.
What is the mass of water formed?We know that we would have to look at the reaction equation and this would give us an idea on how to be able to use the stoichiometry of the reaction equation so as to solve the problem that we have at hand here.
Then we have;
Equation of the reaction; [tex]2H_{2} +O_{2} --- > 2H_{2}O[/tex]
Number of moles of the oxygen = 192 grams /32 g/mol
= 6 moles
If 1 mole of oxygen forms 2 moles of water
6 moles of oxygen would form = 6 * 2/1
= 12 moles of water
Mass of the water = 12 moles * 18 g/mol
= 216 g
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how long does it take for boric acid suppositories to dissolve
Boric acid suppositories dissolve entirely in the in just a few minutes. While utilising a suppository, some people choose to
Boric acid suppositories dissolve entirely in the in just a few minutes. While utilising a suppository, some people choose to wear a . You can limit the growth of yeast by putting gelatin capsules containing boric acid into your . You might observe improvements in symptoms a few days after beginning medication. In most cases, the infection will go away in 1 to 2 weeks. Inconvenience in the are among the negative effects of boric acid use. after entering the capsule, there is a slight burning sensation. sluggish discharge.
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Using moles to balance equations
Use the amounts of each product and reactant
listed below to balance the equations for the
reaction between carbon dioxide and water.
CO2 + H₂O C6H12O6 + O2
CO₂ = 528g H₂O = 216g C6H12O6 = 360g
0₂ = 384g
Carbon dioxide and water combine to form glucose and oxygen (C6H12O6).
What's the balanced equation of CO2 h2o → c6h12o6 o2?Reaction C6H12O6+6O26CO2+6H2O C 6 H 12 O 6 + 6 O 2 → 6 C .
The equation for aerobic respiration is O 2 + 6 H 2 O, which is an oxidation or combustion reaction.
Carbon atom balance
6CO 2 +H 2 O C 6 H 12 O 6 +O 2
Equilibrate the hydrogen atom.
6CO 2 +6H 2 OC 6 H 12 O 6 +O2
The oxygen atom must be balanced.
6CO 2 + 6H 2 O + C 6 H 12 O 6 + 6O 2
The chemical formula for equilibrium is thus:
6CO 2 + 6H 2 O + C 6 H 12 O 6 + 6O 2.
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open odyssey, go to the miscellaneous tab, find the solutions section and click on m i2 molarity vs molality. follow the instructions on the screen and click on all the available buttons. why is molality used instead of molarity in this project? volume changes with temperature under what conditions are the values of molarity and molality very different? high concentrations which value is higher? molality
The molality of the solvent does not change as a function of temperature. Molality is a concentration unit that is unaffected by temperature, it is utilised in this project in place of molarity.
What is molality?Molality, which is determined by the number of moles of solute per kilogram of solvent, is a unit used to describe the concentration of a solute in a solution. It has units of moles per kilogram (mol/kg) and is generally represented by the letter "m".
Since molality is a concentration unit that is unaffected by temperature, it is utilised in this project in place of molarity. The amount of moles of solute per kilogram of solvent is referred to as molality. The molality of the solvent does not change as a function of temperature because the solvent's volume does not. The amount of moles of solute per litre of solution, on the other hand, is referred to as molarity. The molarity fluctuates with temperature in the same way as the solvent's volume does.
In general, the difference between molarity and molality is greater when the concentration of a solution is high. For a solution with the same concentration, molality is almost always greater than molarity.
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true or false: in the context of depressant drugs, chloral hydrate is rapidly metabolized to formaldehyde, which is the active hypnotic agent.true false question.truefalse
Chloral hydrate is used as a hypnotic agent. It is metabolized in liver to form trichloroethanol and trichloroacetic acid.. So it is false that chloral hydrate is metabolized as formaldehyde.
Chloral hydrate is readily absorbed after oral administration and metabolized by alcohol dehydrogenase enzyme in liver. It is metabolized as trichloroethanol and trichloroacetic acid. Trichloroethanol is the metabolite which results in all the pharmacological activity. Which is further metabolized as Trichloroethanol glucoronide and dichloroacetic acid.
Formaldehyde is toxic substance and it is metabolized in liver which has no association with chloral hydrate.
So it is false that chloral hydrate is metabolized to formaldehyde.
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How many grams of oxygen are in 125 grams of FeCO3?
Answer:
In 125 grams of feCO3 287.30 g of FeCO3 oxygen is produce
Explanation:
The Balance Chemical Equation is as follow,
FeCl₂ + Na₂CO₃ → FeCO₃ + 2 NaCl
Calculate Mass of FeCl₂ as,
Molarity = Moles ÷ Volume
Solving for Moles,
Moles = Molarity × Volume
Putting Values,
Moles = 2 mol.L⁻¹ × 1.24 L
Moles = 2.48 mol
Also,
Moles = Mass ÷ M.Mass
Solving for Mass,
Mass = Moles × M.Mass
Putting Values,
Mass = 2.48 mol × 126.75 g.mol⁻¹
Mass = 314.34 g of FeCl2
Calculate Mass of FeCO₃ formed as,
According to equation,
126.75 g (1 mole) FeClZ produces = 115.85 g (1 mole) FeCO₃
So,
314.34 g of FeCl₂ will produce = X g of FeCO₃
Solving for X,
X = (314.34 g × 115.85 g) ÷ 126.75 g
X = 287.30 g of FeCO₃
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What is the molar mass of Cu2CO3? You may round your answer to the nearest hundredth. Be sure to place the correct units on the end
Molar mass of Cu2CO3 is 187.05 g/mol
Molar mass M is the product of the mass of a chemical compound and the molecular weight of the substance. MB = m/nB, where m is the total mass of a sample of a pure material and nB is the molecular weight of substance B, is the formula for it. Pure substance is covered under the definition. Any material has a molecular weight of 6.023 x 1023. (Avagadro number). It can be used to quantify the results of a chemical reaction. Mol is used to indicate the unit.
= 63.5*2+12.01+16*3
= 187.05
so the molar mass of Cu2Co3 is 187.05
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What experimental evidence led Rutherford to develop his atomic model? What was the reasoning that led Rutherford to develop this model?
The experimental evidence that led Rutherford to develop his atomic model is; from a gold foil, alpha particles were shown to disperse backward.
Alpha particles were seen to disperse in the opposite direction after being emitted from a gold foil in the now-famous experiment. In his explanation, which he published in May 1911, Rutherford proposed that the dispersion was brought about by a rigid and compact core at the center of the atom known as the nucleus.
The reasoning that went into developing the atomic model was that the only way that alpha particles could be deflected at enormous angles as if they were impacting on a dense opaque region, and this dense region was located at the center of each atom.
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a chemist must dilute 67.3 ml of 341. mm aqueous copper(ii) sulfate solution until the concentration falls to 256. mm . she'll do this by adding distilled water to the solution until it reaches a certain final volume. calculate this final volume, in milliliters. round your answer to 3 significant digits.
A chemist must dilute the 67.3 ml of the 341 mM of aqueous copper(ii) sulfate solution until the concentration falls to 256 mM is 89.6 mL.
The initial concentration, C1 = 341 mM
The final volume, V1 = 67.3 mL
The final concentration, C2 = 256 mM
The final volume, V2 = ?
By adding the distilled water to the solution until it will reaches a certain final volume :
The expression is given as :
C1 V1 = C2 V2
V2 = C1 V1 / C2
V2 = ( 341 × 67.3 ) / 256
V2 = 89.6 mL
Thus, the final volume in milliliters is 89.6 mL.
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