For a certain chemical reaction, H = - 35.4 kJ and H = - 85.5 kJ. (a)

Question:

For a certain chemical reaction, ΔH° = - 35.4 kJ and ΔH° = - 85.5 kJ.
(a) Is the reaction exothermic or endothermic?
(b) Does the reaction lead to an increase or decrease in the randomness or disorder of the system?
(c) Calculate ΔG° for the reaction at 298 K.
(d) Is the reaction spontaneous at 298 K under standard conditions?