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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.

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