Chem 103 Calculating Standard Enthalpy?

Calculate the standard enthalpy of reaction (in kJ) for the process

3NO(g) --- N2O(g) + NO2(g)

using the standard enthalpies of formation: NO = 90.25 kJ/mol; N2O = 82.05 kJ/mol; NO2 = 33.18 kJ/mol
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