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3.3 Yield and atom economy of chemical reactions

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Question 4

Zinc sulfide forms when zinc is heated with excess sulfur.

Zn+S→ZnS\text{Zn} + \text{S} \rightarrow \text{ZnS}Zn+S→ZnS

Relative atomic masses: S=32\text{S} = 32S=32, Zn=65\text{Zn} = 65Zn=65.

What is the theoretical mass of zinc sulfide that forms from 13.0 g of zinc?

[1]
A

6.40 g6.40\ \text{g}6.40 g

B

39.4 g39.4\ \text{g}39.4 g

C

19.4 g19.4\ \text{g}19.4 g

D

13.0 g13.0\ \text{g}13.0 g

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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