Skip to content

Course home

Sign up

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

EasyMediumHard
123456789101112131415161718192021222324
Question 16
H

Potassium chlorate decomposes when heated.

2KClO3→2KCl+3O22\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_22KClO3​→2KCl+3O2​

Relative atomic masses (ArA_rAr​): O=16\text{O} = 16O=16, Cl=35.5\text{Cl} = 35.5Cl=35.5, K=39\text{K} = 39K=39

What mass of potassium chlorate must decompose to produce 0.60 mol of oxygen?

[1]
A

245 g245\ \text{g}245 g

B

122.5 g122.5\ \text{g}122.5 g

C

73.5 g73.5\ \text{g}73.5 g

D

49 g49\ \text{g}49 g

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.

Question bank