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Enthalpies of formation of CO(g), CO2(g), N2O(g) and N2O4(g) are –110 kJ mol–1 , – 393 kJ mol– 1 , 81 kJ mol1 and 9.7 kJ mol–1 respectively. Find the value of ∆rH for the reaction: 

N2O4(g) + 3CO(g) N2O(g) + 3CO2(g)

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∆rH for a reaction is defined as the difference between ∆fH value of products and ∆fH value of reactants.

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