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7.    (20 pts)      The production of sulfuric acid, a component of acid rain occurs according to...

7.    (20 pts)      The production of sulfuric acid, a component of acid rain occurs according to

                        SO3(g) + H2O(l) →   H2SO4(aq); ∆r HƟ = -227.72 kJ/mol

                        a) Using the thermodynamic data given below state whether this reaction is spontaneous at

                            25 oC. Explain your answer.

                        Substance          ∆f GƟ (kJ/mol)     

                        H2SO4(aq)               -744.53

                        H2O(l)                     -237.13

                        SO3(g)                    -371.06

                         b) Calculate the equilibrium constant at 25 oC.

                        c) Assuming the enthalpy change is independent of temperature calculate the equilibrium constant at 500 oC.

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