Problem: Use standard enthalpies of formation to calculate the standard change in enthalpy for the melting of ice. (The ΔH˚f for H2O(s) for is –291.8 kJ/mol{{ m{kJ}}}/{{ m{mol}}}).

FREE Expert Solution

We are asked to calculate ΔH˚rxn for standard change for the melting of ice.

H2O(l) → H2O(g)


ΔH°rxn=ΔH°f, prod-ΔH°f, react


Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol. 

Also, note that ΔH˚f for elements in their standard state is 0.



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Problem Details

Use standard enthalpies of formation to calculate the standard change in enthalpy for the melting of ice. (The ΔH˚f for H2O(s) for is –291.8 kJ/mol).

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