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Energetics

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Question 16

Nitrogen monoxide is produced from ammonia and air as shown in these equations:

4NH3(g)+3O2(g)→2N2(g)+6H2O(g)ΔH=−1268 kJ mol−1 4\text{NH}_3(\text{g}) + 3\text{O}_2(\text{g}) \rightarrow 2\text{N}_2(\text{g}) + 6\text{H}_2\text{O}(\text{g}) \quad \Delta H = -1268\text{ kJ mol}^{-1} 4NH3​(g)+3O2​(g)→2N2​(g)+6H2​O(g)ΔH=−1268 kJ mol−1 N2(g)+O2(g)→2NO(g)ΔH=+180 kJ mol−1 \text{N}_2(\text{g}) + \text{O}_2(\text{g}) \rightarrow 2\text{NO}(\text{g}) \quad \Delta H = +180\text{ kJ mol}^{-1} N2​(g)+O2​(g)→2NO(g)ΔH=+180 kJ mol−1

What is the enthalpy change (in kJ mol−1\text{kJ mol}^{-1}kJ mol−1) for the following reaction?

4NH3(g)+5O2(g)→4NO(g)+6H2O(g) 4\text{NH}_3(\text{g}) + 5\text{O}_2(\text{g}) \rightarrow 4\text{NO}(\text{g}) + 6\text{H}_2\text{O}(\text{g}) 4NH3​(g)+5O2​(g)→4NO(g)+6H2​O(g)
A

−1088-1088−1088

B

−1448-1448−1448

C

−908-908−908

D

−1628-1628−1628

Markscheme

Energetics Questions

  1. A Level
  2. /Chemistry
  3. /Energetics

34 exam-style questions on AQA A Level Chemistry Energetics, covering Enthalpy change, Calorimetry, Applications of Hess's law, and Bond enthalpies. Each one has a worked solution and a mark scheme showing where the marks go.

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