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5.1 Monitoring chemical reactions

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Question 44

Sodium chlorate decomposes to make oxygen. Oxygen is the desired product.

2NaClO3→2NaCl+3O22\text{NaClO}_3 \rightarrow 2\text{NaCl} + 3\text{O}_22NaClO3​→2NaCl+3O2​

SubstanceMrM_rMr​
NaCl\text{NaCl}NaCl58.5
O2\text{O}_2O2​32.0

A process starts with 21.3 kg of sodium chlorate.

a.

Calculate the atom economy for making oxygen.

[2]
b.

Calculate the maximum mass of the waste product made.

[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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