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3.3 Yield and atom economy of chemical reactions

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Question 3
H

Magnesium burns in oxygen.

2Mg+O2→2MgO2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}2Mg+O2​→2MgO

Relative atomic masses: O=16\text{O} = 16O=16, Mg=24\text{Mg} = 24Mg=24.

What is the minimum mass of magnesium needed to make 20.0 g of magnesium oxide?

[1]
A

10.0 g10.0\ \text{g}10.0 g

B

12.0 g12.0\ \text{g}12.0 g

C

20.0 g20.0\ \text{g}20.0 g

D

33.3 g33.3\ \text{g}33.3 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

39 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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