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AP Chemistry/Unit 6: Thermodynamics
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Enthalpy Change Using Hess's Law

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Given the thermochemical equations below:

N₂(g) + 3H₂(g) → 2NH₃(g) ΔH = -92.2 kJ
N₂(g) + O₂(g) → 2NO(g) ΔH = +180.6 kJ
H₂(g) + ½O₂(g) → H₂O(l) ΔH = -285.8 kJ
NO(g) + ½O₂(g) → NO₂(g) ΔH = -57.1 kJ

What is the value of ΔH for the following reaction?

4NH₃(g) + 7O₂(g) → 4NO₂(g) + 6H₂O(l)

A

-1514.8

B

+1422.6

C

-1397.6

D

-1330.4

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