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3.2 Use of amount of substance in relation to masses of pure substances

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Question 2
H

A student investigated two substances, water and magnesium oxide.

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1, O=16\text{O} = 16O=16, Mg=24\text{Mg} = 24Mg=24

a.

Calculate the amount, in moles, of water, H2O\text{H}_2\text{O}H2​O, in 90 g of water.

[2]
b.

Calculate the relative formula mass (MrM_rMr​) of magnesium oxide, MgO\text{MgO}MgO.

[1]
c.

Calculate the mass of 0.25 mol of magnesium oxide.

[2]
Markscheme

3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

40 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles, 3.2.2 Amounts of substances in equations, 3.2.3 Using moles to balance equations, 3.2.4 Limiting reactants, 3.2.5a Concentration of solutions, and 3.2.5b Relating mass, volume and concentration. Each one has a worked solution and a mark scheme showing where the marks go.

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