Verified answer

Chemical Reaction: NaOH(s) + HCl(aq) → NaCl(aq) + H2O(l)

Heat of formation:.....-425.93 .... -92.30 ...... -407.27 ... -285.83 ... all in kJ/mol

Hess's Law: ΔH(rxn) = Sum[ΔH(f) products] - Sum[ΔH(f) reactants]

ΔH(rxn) = [(1 mol)(-407.27 kJ/mol) + (1 mol)(-285.83 kJ/mol)] - [(1 mol)(-425.93 kJ/mol) + (1 mol)(-92.30)]

ΔH(rxn) = Now it's all arithmetic. Just keep your signs straight.

Hope this is helpful to you. JIL HIR