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5.1 Monitoring chemical reactions

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Question 4

A process decomposes potassium chlorate to make oxygen.

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

A technician heats 12.26 g of potassium chlorate. The percentage yield is 80.0%.

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

What mass of oxygen is collected?

[1]
A

1.92 g

B

4.80 g

C

6.00 g

D

3.84 g

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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