Mole concept

Question 1

How does one calculate the number of moles?

Answer 1

number of particles/6x10^23

Question 2

What is the formula for calculations involving the mole and molar mass?

Answer 2

mass/mole x molar mass

Question 3

What is the formula for calculations involving mole and volume for gases?

Answer 3

• volume of gas/mole x 24 dm^3

Question 4

What is the formula for percentage composition?

Answer 4

[number of atoms of an element in the formula x Ar of element/Mr of compound] x 100%

Question 5

What is the formula of percentage yield?

Answer 5

percentage yield = [experimental mass of product/theoretical mass of product] x100%

Question 6

What is the formula of percentage purity?

Answer 6

percentage purity = [mass of pure reactant present in impure sample/mass of impure sample] x 100%

Question 7

What is the formula for concentration in mol/dm^3?

Answer 7

number of moles/volume of solution in dm^3

Question 8

What is the formula for concentration in g/dm^3

Answer 8

number of grams of solute/volume of solution in dm^3

Question 9

What is the formula of concentration in mol/dm^3 given the concentration in g/dm^3?

Answer 9

concentration in g/dm^3/molar mass of solute

Question 10

What is the formula for number of moles?

Answer 10

(volume of solution in dm^3) x (concentration of solution in mol/dm^3)