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5.1 Monitoring chemical reactions

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Question 1

A technician checks a calculation for the reaction between magnesium and nitrogen.

3Mg+N2→Mg3N2 \mathrm{3Mg + N_{2} \rightarrow Mg_{3}N_{2}} 3Mg+N2​→Mg3​N2​

Relative atomic mass (ArA_rAr​): Mg = 24.3 N = 14.0

The technician uses 7.29 g of magnesium, with nitrogen in excess.

Which result gives the theoretical yield of magnesium nitride?

[1]
A

3.37 g

B

30.3 g

C

10.1 g

D

8.69 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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