A certain reaction has ΔHo = -19.5 kJ and ΔSo = +42.7 J/K.

a) Is the reaction endothermic or exothermic?
b) Does the reaction lead to an increase or a decrease in the disorder of the system?
c) Calculate ΔGo for the reaction at 298 K.
d) Is the reaction spontaneous at 298 K under standard conditions?

Show your work and explain for each question