1.2 Amount Of Substance

Question 1

Relative molecular mass

Answer 1

The mean mass of one entity of a substance compared to 1/12 the mass of an atom of carbon-12

Question 2

Empirical formula

Answer 2

The simplest ratio of whole number atoms of each element in a compound

Question 3

Molecular formula

Answer 3

The actual number of whole number atoms of each element in a compound

Question 4

Acid + alkali

Acid + base

Acid + metal

Acid + carbonate

Answer 4

Salt + water

Salt + water

Salt + hydrogen

Salt + water + carbon dioxide

Question 5

Molar formulas

Answer 5

Moles = mass/ Mr

Moles = vol/ mol vol

Moles = concentration X vol

Question 6

Ideal gas equation

Answer 6

PV = nRT

Dm3 to m3 - x10-3

Cm3 to m3 - x10-6

C to K - add 273

Question 7

Percentage yield

Answer 7

Percentage yield =

actual yield / theoretical yield
X 100

Question 8

% atom economy

Answer 8

Mass of desired product / total mass of reactants

X 100

Question 9

Relative atomic mass

Answer 9

The mean mass of one atom of an element compared to 1/12 the mass of an atom of carbon-12