A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2009 · Q51 Mark

The first stage in the industrial production of nitric acid from ammonia can be represented by the following equation. 4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) Using the following standard enthalpy change of formation data, what is the value of the standard enthalpy change, ∆Ηº, for this reaction? [Figure 5.1]

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A+905.2 kJ mol-1

B-105.4 kJ mol-1

C-905.2 kJ mol-1

D-1274.0 kJ mol⁻¹

✓ Correct answer

C: -905.2 kJ mol-1

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2009 Paper 1 Variant 2, question 5.

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