Given the data
N21g2 + O21g2¡ 2 NO1g2 H = +180.7 kJ
2 NO1g2 + O21g2¡ 2 NO21g2 H = -113.1 kJ
2 N2O1g2¡ 2 N21g2 + O21g2 H = -163.2 kJ
use Hess’s law to calculate H for the reaction
N2O1g2 + NO21g2¡ 3 NO1g2
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