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# Hess's Law

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1.

2CLF (g) + O2(g) --> CL2O + F20 (Hrxn = 167.4 kj/mol)

2CLF3(g) + 2O2(g) --> Cl2O(g) + 3F2O(g) (Hrxn = 341.4 kj/mol)

2F2(g) + O2(g) --> 2F2O (Hrxn = -43.4 kJ/mol)

Using Hess' law, what is the Hrxn for ClF +F2 --> ClF3 in kj/mol (assume temperature is the same)?

2. Given NO(g) + NO2(g) --> N2O3 H=-40.2kJ
N2O4(g) --> 2NO2 H=23.4kj

Calculate the enthalphy change for the following using hess' law
2N2O3(g) --> 2NO(g) + N2O4

##### Solution Summary

This solution explains how to use Hess's Law to calculate the heat of a reaction.

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