Stoichiometry

Question 1

Relative atomic mass (Ar)

Answer 1

The average mass of atoms

Question 2

Relative formula mass (Mr)

Answer 2

The sum of all the relative atomic masses shown of all the elements shown in the formula

Question 3

Define mole

Answer 3

The amount of substance that contains 6x10^23 atoms,ions or molecules.

Question 4

Equation for finding mass

Answer 4

no. of moles= mass/Mr

Question 5

Equation to find volume and concentration

Answer 5

Moles= Conc. x Volume

Question 6

Concentration unit

Answer 6

mol/dm cube

Question 7

Volume unit

Answer 7

dm^3

Question 8

How to convert from cm^3 to dm^3

Answer 8

divide by 1000

Question 9

Avogadro’s constant

Answer 9

6.02x10^23

Question 10

Equation to find the volume of a gas

Answer 10

Volume=Moles/24

Question 11

Percentage yield formula

Answer 11

(Actual yield/ Theoretical yield) x 100

Question 12

Define limiting reagent

Answer 12

The limiting reactant is the reactant which is not present in excess in a reaction

Question 13

Percentage purity formula

Answer 13

(Mass of pure substance/ Mass of impure substance) x 100