We are asked to calculate ΔH˚rxn for standard change for the melting of ice.
H2O(l) → H2O(g)
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.
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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