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5.1 Monitoring chemical reactions

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Question 35

Copper reacts with excess sulfur when they are heated together, making copper(I) sulfide.

2Cu+S→Cu2S \mathrm{2Cu + S \rightarrow Cu_{2}S} 2Cu+S→Cu2​S

Relative atomic mass (ArA_rAr​): S = 32.1 Cu = 63.5

The percentage yield of copper(I) sulfide is 75.0%.

Calculate the mass of copper needed to obtain an actual yield of 9.55 g of copper(I) sulfide.

[3]
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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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