Skip to content

Course home

Question bank·5.1 Monitoring chemical reactions
Sign up

5.1 Monitoring chemical reactions

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667
Question 37

A chemist heats potassium chlorate to produce oxygen.

2KClO3→2KCl+3O2 \mathrm{2KClO_{3} \rightarrow 2KCl + 3O_{2}} 2KClO3​→2KCl+3O2​

Relative atomic masses (ArA_rAr​): K = 39.1, Cl = 35.5, O = 16.0

A reaction vessel contains 24.5 g of potassium chlorate.

Calculate the theoretical yield of oxygen.

[4]
Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

More questions