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Earlier discussion
2 older comments kept for context.
Adegoke Sharafadeen
The formula posted for the explanation is wrong,also the parameters given in the question are not complete because enthalpy of hydrogen is not given at the same time the correct formula is sum of enthalpy of product minus sum of enthalpy of reactants. That is my submission. Thanks
Oluwaseun Adeyemi
Standard enthalpy change of a process = ∆H° process = ∆H° F reactant - DF° products