What energy changes take place when the nitrogen molecule forms?
select one:
a. energy is released
b. endothermic physical change
c. endothermic chemical change
d. energy is absorbed

Ithink is d. physical property

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.