Problem: Using Hess’s Law, determine the ΔH of the following reaction: N2(g) +  2O2(g)  →  2NO2(g) Given the following equations N2(g)  +  3H2(g)  →  2NH3(g)                                       ΔH = -115 kJ 2NH3(g)  +  4H2O(l)  →  2NO2(g)  +  7H2(g)                ΔH = -142.5 kJ H2O(l)  →  H2(g)  +  1/2O2(g)                                      ΔH = -43.7 kJ        

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Using Hess’s Law, determine the ΔH of the following reaction:

N2(g) +  2O2(g)  →  2NO2(g)

Given the following equations

N2(g)  +  3H2(g)  →  2NH3(g)                                       ΔH = -115 kJ

2NH3(g)  +  4H2O(l)  →  2NO2(g)  +  7H2(g)                ΔH = -142.5 kJ

H2O(l)  →  H2(g)  +  1/2O2(g)                                      ΔH = -43.7 kJ

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