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5.1 Monitoring chemical reactions

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Question 7

A chemist investigates a reaction for preparing an electrode material.

In one experiment, the starting materials are completely converted into products. The atom economy for the electrode material is 70.0%. The experiment forms 18.0 g of unwanted products.

Calculate the mass of starting materials used in the experiment.

[1]
A

60.0 g

B

12.6 g

C

25.7 g

D

42.0 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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