3. Discuss the difference between molarity and molality, state the units of each, state the symbol for each, and give an example of how each can be used when you are determining the concentration of a solution.

Answers

Answer 1

Molality(m) or molal concentration is a measure of concentration and it refers to amount of substance in a specified amount of mass of the solvent. Used unit for molality is mol/kg which is also sometimes denoted as 1 molal. It is equal to the moles of solute (the substance being dissolved) divided by the kilograms of solvent (the substance used to dissolve).

Molarity(M) or molar concentration is also a measure of concentration and represents the amount of substance per unit volume of solution(number of moles per litre of solution. Used unit for molarity is mol/L or M. A solution with a concentration of 1 mol/L is equivalent to 1 molar (1 M).

Molality is preferred when the temperature of the solution varies, because it does not depend on temperature, (neither number of moles of solute nor mass of solvent will be affected by changes of temperature), while molarity changes as temperature changes(volume of solution changes as temperature changes).

Answer 2

Final answer:

Molarity is the number of moles of solute per liter of solution, denoted as 'M', while molality is the number of moles of solute per kilogram of solvent, denoted as 'm'. Molarity is used for reactions where volume changes are insignificant, and molality where temperature changes are considered.

Explanation:

Difference Between Molarity and Molality

The difference between molarity and molality involves how they calculate concentration, the units used, and their symbols. Both are methods to express the amount of solute in a solution and are used to determine quantities in chemical reactions.

Molarity (M)

Molarity is the number of moles of a solute dissolved per liter of solution. It is a very useful measurement for evaluating the concentration of solutions, especially in discussions involving chemical reactions where a solute is a product or a reactant. The unit for molarity is moles per liter (mol/L), and its symbol is 'M'. For example, if we have a solution with 1 mole of sodium chloride in 1 liter of water, the molarity would be 1 M, useful in determining the resulting concentration of a diluted solution.

Molality (m)

Molality, on the other hand, is the number of moles of solute per kilogram of solvent. Unlike molarity, molality does not change with temperature since mass does not change with temperature. The unit for molality is moles per kilogram (mol/kg), and its symbol is 'm'. For example, if there are 2 moles of glucose dissolved in 1 kilogram of water, the molality of the solution would be 2 m, important when temperature changes affect the experiment.

Related Questions

what is the standard notation of the isotope H-2

Answers

Deutirium is the name of H-2 isotope

1. Aqueous solutions of chromium(III) iodide and sodium hydroxide react to give a chromium(III) hydroxide precipitate and aqueous sodium iodide.
2. Aqueous solutions of iron(II) sulfate and barium nitrate react to give a barium sulfate precipitate and aqueous iron(II) nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if there is no reaction.

Answers

1- The original equation of the reaction is :
CrI3 + NaOH → Cr(OH)3 + NaI
but this is not a balanced equation so we have to balance it :
-first, we have 3 I atoms on the left side and 1 I atom on the right side
so to makes the no.of atoms on both sides equal we put 3NaI instead of NaI
CrI3 + NaOH → Cr(OH)3 + 3NaI
- then no.of Na atoms on the left side is 1 and on the right side is 3 so, we put 3NaOH instead of NaOH
CrI3 + 3NaOH → Cr(OH)3 + 3NaI
now we have :
Cr atoms = 1 on both sides
I atoms = 3 on both sides
Na atoms = 3 on both sides
O&H atoms = 3 on both sides
So the final balanced equation of our reaction is:
CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq)

2 - the chemical equation of the second reaction is :
FeSO4 + Ba(NO3)2 → BaSO4 + Fe(NO3)2
let's see if it is the balanced equation or not?
we have:
no of Fe atom on both sides = 1
no of (SO4) atom on both sides are equal
no of Ba atom on both sides = 1
no of (NO3) group on both sides= 2
so this is our balanced equation, so the final equation for this reaction is:
FeSO4(aq) + Ba(NO3)2(aq) →BaSO4(s) + Fe(NO3)2(aq)

Final answer:

For reaction 1, the balanced equation is CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq). For reaction 2, it is FeSO4(aq) + Ba(NO3)2(aq) → BaSO4(s) + Fe(NO3)2(aq). The products Cr(OH)3(s) and BaSO4(s) form precipitates in their reactions.

Explanation:

Based on your questions, we can establish the following balanced chemical equations:

The synthesis of chromium(III) hydroxide from chromium(III) iodide and sodium hydroxide:CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq).The synthesis of barium sulfate from iron(II) sulfate and barium nitrate:FeSO4(aq) + Ba(NO3)2(aq) → BaSO4(s) + Fe(NO3)2(aq).

This shows the precipitation reactions that can occur between certain metallic ions in solution. The precipitates are the insoluble products - chromium(III) hydroxide and barium sulfate, respectively.

Learn more about Chemical Reaction here:

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The energy driving a windmill each minute equals 2.75 kilojoules. If 1.6 kilojoules of energy is given up by the windmill as thermal energy from friction and electrical resistance, how many kilojoules of energy are provided as electricity to the power line?

Answers

The answer would be 1.15 kilojoules. ope this helps.

I need help this one:(( please help me

Answers

The answer is D because inherited is in the genes and enviornment is what happens around you

Which best describes the importance of the microscope to the development of cell theory? Microscopes color different parts of cells so they can be seen with the naked eye. Cells are too small to see with the naked eye, and a microscope magnifies them. The lenses in a microscope reduce the image of an organism to the size of a cell. Microscopes trap “animalcules” from pond water so they can be studied.

Answers

Cells are too small to see with the naked eye.

It's pretty straight forward, use the cross-out method.

1) Microscopes MAGNIFY images, they don't color the cells. In fact, scientists have to use these chemicals to "stain" or color the cells to see them more easily through microscopes.

2) If the lenses of a microscope reduced the image of an organism to the size of a cell, you'd be seeing a very tiny human through your microscope, instead of actual cells.

3) Microscopes don't "trap" anything. In fact, scientists use plates or slides under microscopes to contain what they're studying.

Answer:The correct answer is B hope this helps

How can we find the volume of this fish tank? Please I needed but Good

Answers

Answer;

Find the number of 1-foot cubes that fill the fish tank

Explanation;

Volume of a cuboid such as the fish tank is given by the product of length width and height;

Such that; Volume = length × width × height

Similarly, we can count the number of 1 foot cube that can fill the fish tank.

And since each cube has a volume of 1 cubic ft, then the number of cubes will be equivalent to the volume of the fish tank in cubic ft.

Answer:

The correct answer is find the number of 1 foot cubes that fill the fish tanks.

Explanation:

Volume is defined as amount of space occupied by an object.

Number of 1 foot cubes lying on the length of fish tank ,l= 5 feet

Number of 1 foot cubes lying on the width of fish tank,w = 3 feet

Number of 1 foot cubes lying on the height of fish tank ,h= 3 feet

Volume of the cuboid fish tank will be :

The volume of fish tanks id 45 cubic feet.

Explanation:

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