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3.3 Yield and atom economy of chemical reactions

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Question 38

A process converts sulfur dioxide into calcium sulfite. Calcium sulfite is the desired product.

ReactionEquation
1CaO+SO2→CaSO3\mathrm{CaO + SO_2 \rightarrow CaSO_3}CaO+SO2​→CaSO3​
2CaCO3+SO2→CaSO3+CO2\mathrm{CaCO_3 + SO_2 \rightarrow CaSO_3 + CO_2}CaCO3​+SO2​→CaSO3​+CO2​
ElementCaCSO
Relative atomic mass (ArA_rAr​)40123216
a.

Calculate the percentage atom economy of Reaction 2.

Give your answer to 3 significant figures.

[3]
b.

Explain why Reaction 1 has a higher atom economy than Reaction 2.

[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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