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3.3 Yield and atom economy of chemical reactions

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Question 5

A processing plant produces zinc using the reaction shown.

2ZnO+C→2Zn+CO2\mathrm{2ZnO + C \rightarrow 2Zn + CO_2}2ZnO+C→2Zn+CO2​

Zinc is the product required from the process.

Relative atomic masses: Zn=65\mathrm{Zn} = 65Zn=65, O=16\mathrm{O} = 16O=16, C=12\mathrm{C} = 12C=12.

a.

Calculate the percentage atom economy for the production of zinc.

[3]
b.

The carbon dioxide was previously sold for use as a raw material in another process. The buyer has stopped using the carbon dioxide, and no other use is available.

Explain why this change increases the proportion of the reactants that the plant treats as waste.

[2]
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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