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3.3 Yield and atom economy of chemical reactions

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Question 16

A technician heats 25.0 g of zinc carbonate to make zinc oxide.

ZnCO3→ZnO+CO2\mathrm{ZnCO_3 \rightarrow ZnO + CO_2}ZnCO3​→ZnO+CO2​

Relative formula masses (MrM_rMr​):

ZnCO3=125\mathrm{ZnCO_3 = 125}ZnCO3​=125

ZnO=81\mathrm{ZnO = 81}ZnO=81

The technician collects 12.2 g of zinc oxide.

a.

Calculate the percentage yield of zinc oxide.

[4]
b.

Suggest one reason why the percentage yield is less than 100%.

[1]
Markscheme

3.3 Yield and atom economy of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Yield and atom economy of chemical reactions

104 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1a Percentage yield, 3.3.1b Theoretical mass of a product, 3.3.2a Atom economy, and 3.3.2b Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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