Given the Thermochemical Equation 2SO₂ + O₂ $\rarr$ 2SO₃ $\Delta$ H°_rxn = -198 KJ/mol, What Is the Standard Enthalpy Change

Multiple Choice

Given the thermochemical equation 2SO₂ + O₂ $\rarr$ 2SO₃, $\Delta$ H°_rxn = -198 kJ/mol, what is the standard enthalpy change for the decomposition of one mole of SO₃?

A) 198 kJ/mol
B) -99 kJ/mol
C) 99 kJ/mol
D) 396 kJ/mol
E) -198 kJ/mol