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5.2 Controlling reactions

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Question 34

Iron is used as a catalyst in the reaction that makes ammonia from nitrogen and hydrogen.

The products are 92 kJ/mol lower in energy than the reactants. Without iron, the peak on the reaction profile is 322 kJ/mol above the products.

With iron, the peak is 130 kJ/mol lower than the peak without iron.

What is the activation energy of the reaction when iron is used?

[1]
A

100 kJ/mol100\,\mathrm{kJ/mol}100kJ/mol

B

192 kJ/mol192\,\mathrm{kJ/mol}192kJ/mol

C

230 kJ/mol230\,\mathrm{kJ/mol}230kJ/mol

D

284 kJ/mol284\,\mathrm{kJ/mol}284kJ/mol

Markscheme

5.2 Controlling reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.2 Controlling reactions

122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.

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