iGCSE Calculations

What is the Mr of Magnesium chloride

• 95

• 59.5

• 83.5

• 24

What is the Mr of Iron (III) Oxide

• 160

• 72

• 200

• 320

What is the % by mass of magnesium in magnesium oxide

How many moles are there in 42 g of carbon

mass =

• mol * Mr

• mol / Mr

• Mr / mol

• mol + Mr

Moles =

• mass / Mr

• Mr / mass

• Mass * Mr

• Vol / Conc

What is the mass of 2 moles of carbon dioxide

• 88 g

• 88 kg

• 44 g

• 22 g

Which contains more atoms, 1 mol of carbon dioxide molecules or 2 mol of oxygen molecules

• 1 mol of carbon dioxide

• 2 mol of oxygen

What is the mass of 0.8 mol of nickel (to one decimal place)

What mass of aluminium oxide is produced when 135 g of aluminium is combusted completely in excess oxygen.

4Al + 3O₂ --> 2Al₂O₃