The Moles

1) What is the mass of…?

a) 1 mole of nitrogen atom

b) 0.5 mole of oxygen molecule

c) 2 moles of hydrochloric acid (HCL)

d) 1 mole of calcium chloride (CaCl)

2) How many moles are there in…?

a) 2g of sulphur atoms

b) 0.8g of iodine molecule

c) 5.6g of Sodium Sulphate (Na^2SO^4)

3) BaCl^2 + H^2SO^4

= BaSO^4 + 2HCL

10g ?g

Find the mass of BaSO^4.

4) Magnesium reacts with sulphuric acid to produce a solution of magnesium sulphate. If this is allowed to crystallize to produce a formula MgSO^47H^2O. Write the equation for this reaction and calculate the mass of magnesium sulphate heptahydrate that could be produced from 4g of magnesium.

Mark Scheme

1) a) 14g

b) 16g

c) 73g

d) 75.5

2) a) 0.0625mol

b) 0.003mol

c) 0.04mol

3) 0.05mol

4) 20.04g