hess law problem chemistry ?

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Blackberry

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Calculate ?Hrxn for the reaction below.
CO(g) + NO(g) CO2(g) +1/2 N2(g)
You are given the following set of reactions.
CO(g) + 1/2 O2(g) CO2(g) ?H = -283.0 kJ
N2(g) + O2(g) 2 NO(g)?H = 180.6 kJ
 
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