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3.3 Yield and atom economy of chemical reactions

3.3 Yield and atom economy of chemical reactions

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Question 14

Manganese is extracted from manganese(II) oxide by reduction with carbon.

a.

Explain why carbon can be used to extract manganese from manganese(II) oxide.

[2]
b.

An equation for the reaction is:

MnO+C→Mn+CO \text{MnO} + \text{C} \rightarrow \text{Mn} + \text{CO} MnO+C→Mn+CO

Calculate the percentage atom economy for the reaction to produce manganese.

Relative atomic masses (ArA_rAr​):

  • C=12\text{C} = 12C=12
  • Mn=55\text{Mn} = 55Mn=55

Relative formula mass (MrM_rMr​):

  • MnO=71\text{MnO} = 71MnO=71

Give your answer to 3 significant figures.

[3]
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

31 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1 Percentage yield and 3.3.2 Atom economy. Each one has a worked solution and a mark scheme showing where the marks go.

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