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5.1 Monitoring chemical reactions

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Question 46

A chemist is assessing this reaction as a laboratory method for preparing oxygen.

2KClO3→2KCl+3O2 2\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_2 2KClO3​→2KCl+3O2​

The relative formula masses are Mr(KCl)=74.5M_r(\text{KCl}) = 74.5Mr​(KCl)=74.5 and Mr(O2)=32.0M_r(\text{O}_2) = 32.0Mr​(O2​)=32.0.

Calculate the atom economy for making oxygen.

[1]
A

30.0%

B

60.8%

C

56.3%

D

39.2%

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.

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