5. What is the molar enthalpy of the formation of 1mol H2SO4(l) given the following information?
2H2(g) + O2(g) → 2H2O(g) ΔHrxn = -484kJ
2S(s) + 3O2(g) → 2SO3(g) ΔHrxn = -890kJ
H2(g) + 2O2(g) + S(s)→ H2SO4(l) ΔHrxn = -814kJ
H2O(g) + SO3(g)→ H2SO4(l) ΔHrxn = xkJ
