Chapter 17, Problem 108CWP

Consider the reaction:

${\text{H}}_{\text{2}}\text{S}\left(g\right)+{\text{SO}}_{\text{2}}\left(g\right)\to 3\text{S}\left(g\right)+2{\text{H}}_{\text{2}}\text{O}\left(l\right)$

for which ∆H is −233 kJ and ∆S is −424 J/K.

a. Calculate the free energy change for the reaction (∆G) at 393 K.

b. Assuming ∆H and ∆S do not depend on temperature, at what temperatures is this reaction spontaneous?