Question

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Answer 1

Answer:

Explanation:

We apply Hess's law in thermochemistry.

We know standard enthalpy of reaction is the difference between enthalpies of product and reactant.

Standard enthalpy of any gas in free state is 0.

So,it is 0 for oxygen.Finally,we get the answer -113.04kJ/mol, implying that reaction is exothermic.