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3.2 Energetics

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Question 9

Ammonia is made from nitrogen and hydrogen in this reaction:

N2+3H2→2NH3 \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 N2​+3H2​→2NH3​

Use these average bond energies.

BondBond energy (kJ/mol)
N≡N945
H-H436
N-H391

Calculate the energy change for this reaction and state whether the reaction is exothermic or endothermic.

[4]
Markscheme

3.2 Energetics Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Energetics

106 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.

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