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5.1 Monitoring chemical reactions

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Question 2

Zinc reacts with oxygen to make zinc oxide.

2Zn+O2→2ZnO \mathrm{2Zn + O_{2} \rightarrow 2ZnO} 2Zn+O2​→2ZnO

Relative atomic mass (ArA_rAr​): Zn\mathrm{Zn}Zn = 65.4 Relative formula mass (MrM_rMr​): ZnO\mathrm{ZnO}ZnO = 81.4

A reaction produces 16.3 g of zinc oxide. Assume all the zinc forms zinc oxide.

What mass of zinc is needed?

[1]
A

6.55 g

B

26.2 g

C

20.3 g

D

13.1 g

Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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