2NO(g) O2(g) - 2NO2(g), AH=-113.1 kJ 2N20(g) 2N2(g) + O2(g), AH=-163.2 kJ -> use Hess's law to calculate AH for the following reaction: N20(g) + NO2(g)-3NO(g) Express the enthalpy in kilojoules to four significant digits. VO AZ ? AH

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