Skip to content

Course home

Sign up

5.1 Monitoring chemical reactions

EasyMediumHard
12345678910111213141516171819202122
Question 11
F

A student makes copper sulfate by reacting copper oxide with excess dilute sulfuric acid.

CuO+H2SO4→CuSO4+H2O \mathrm{CuO + H_{2}SO_{4} \rightarrow CuSO_{4} + H_{2}O} CuO+H2​SO4​→CuSO4​+H2​O

The student starts with 3.98 g of copper oxide and makes 6.39 g of copper sulfate.

Relative formula mass (MrM_rMr​): CuO\mathrm{CuO}CuO = 79.5 CuSO4\mathrm{CuSO_{4}}CuSO4​ = 159.6

What is the percentage yield of copper sulfate?

[1]
A

49.8%

B

80.0%

C

125%

D

160.6%

Markscheme

5.1 Monitoring chemical reactions Questions

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

57 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.

Question bank