The standard enthalpy change for the reaction of SO3(g) with H2O(l) to yield H2SO4(aq) is ΔH° = -227.8 kJ.
Use the following information
S(s) + O2(g) → SO2(g) ΔH° = -296.8 kJ
SO2(g) + 1/2 O2(g) → SO3(g) ΔH° = -98.9 kJ
to calculate ΔH°f for H2SO4(aq) (in kilojoules per mole).
[For H2O(l). ΔH°f = -285.8 kJ/mol].
Express your answer using four significant figures.