Now consider the following set of reactions:
2NO2 → 2NO + O2, H=109 kJ/mol
N2O4 → 2NO + O2, H=172 kJ/mol
The equations given in the problem introduction can be added together to give the following reaction:
overall: N2O4 → 2NO2
However, one of them must be reversed. Which one:
a. 2NO2 → 2NO + O2
b. N2O4 → 2NO + O2
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