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It is often difficult to tell whether a reaction is exothermic (gives off heat) or endothermic...

It is often difficult to tell whether a reaction is exothermic (gives off heat) or endothermic (takes in heat) just by looking at it. For the following reaction, describe what information you would need to know about specific bonds (be specific about numbers of bonds, bonds breaking and being formed, etc.) to tell whether the reaction is exothermic or endothermic:

2 CuO (s) + NO (g) ? Cu2O (s) + NO2 (g)

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