Chapter1

Question 1

Atom economy

Answer 1

% atom economy = molar mass of desired products/ molar mass of all reactants • 100

Question 2

How many atoms are in a mole

Answer 2

Moles * Avogadro constant

Question 3

Avogadro constant

Answer 3

6.02 *10^ 23

Question 4

Relative atomic mass

Answer 4

Ar, is the weighed average mass of the naturally occurring Isotope

Question 5

Molecular mass

Answer 5

Mr, average weighted mass of a molecule or the sum of ar

Question 6

Calculating amount of substance (n)

Answer 6

n= m/M

Question 7

Calculating mass (m)

Answer 7

m = nM

Question 8

Calculating molar mass using moles

Answer 8

M= m/n

Question 9

Moles from concentration and volume

Answer 9

n =C•V

Question 10

Concentration calculation

Answer 10

C= n/v

Question 11

Volume calculation

Answer 11

V = n/C

Question 12

Molar ratios

Answer 12

The coefficients in a balanced chemical equation that well us the mole ratios of reactants and products

Question 13

Mole fraction

Answer 13

Amount in mol of one component in e mixture divided by the total amount of all components in the mixture
Xî=ni/n total

Question 14

% Composition by mass

Answer 14

Total mass of element/ total mass of compound •100

Question 15

Molecular formula

Answer 15

Actual number of atoms in a compound C4H10

Question 16

Empirical formula

Answer 16

Lowest whole number ratio of atoms in a compound C2H5

Question 17

Water of crystalisation

Answer 17

Fixed number of water molecules present in one formula unit of salt

Question 18

Limiting reagent

Answer 18

Limits amount of products made

Question 19

Excess reactant

Answer 19

Remains after reaction finished

Question 20

Calculations for limiting reagent

Answer 20

1. Mol of each reactant
2. Divide the mol by coefficient in balanced equation
3. Lowest value is the limiting reagent

Question 21

Theoretical yield

Answer 21

Maximum amount of product that can be formed in a chemical reaction

Question 22

% Yield

Answer 22

Actual yield/ theoretical yield • 100