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3.3 Yield and atom economy of chemical reactions

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Question 15

A chemical company makes compound W by reacting two gases together in a closed reactor.

Which outcome would account for a percentage yield of W below 100 %?

[1]
A

One gas is supplied in excess so that all of the other gas can react.

B

The reaction reaches equilibrium while some of the reactants remain.

C

The maximum mass of W is calculated from the mass of the limiting reactant.

D

The reaction has an atom economy below 100 % because a by-product also forms.

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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