9Enthalpy Cycles Bond EnthalpiesMedium1 markSulfur can be oxidised in two ways.S(s)+O2(g)→SO2(g)ΔH⊖=−296.5 kJ mol−12S(s)+3O2(g)→2SO3(g)ΔH⊖=−791.4 kJ mol−1Sulfur trioxide can be made from sulfur dioxide and oxygen.2SO2(g)+O2(g)→2SO3(g)What is the standard enthalpy change for this reaction?A−1384.4 kJ mol−1B−989.8 kJ mol−1C−494.9 kJ mol−1D−198.4 kJ mol−1Grade answerSolutionGrading criteria