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3.3 Yield and atom economy of chemical reactions

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Question 7

A process burns hydrogen sulfide in oxygen:

2H2S+3O2→2SO2+2H2O2\text{H}_2\text{S} + 3\text{O}_2 \rightarrow 2\text{SO}_2 + 2\text{H}_2\text{O}2H2​S+3O2​→2SO2​+2H2​O

Relative atomic masses: H=1\text{H} = 1H=1, S=32\text{S} = 32S=32, O=16\text{O} = 16O=16.

What is the percentage atom economy for the production of sulfur dioxide?

[1]
A

39.0 %39.0\ \%39.0 %

B

22.0 %22.0\ \%22.0 %

C

78.0 %78.0\ \%78.0 %

D

19.5 %19.5\ \%19.5 %

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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