If a gas at STP occupies 72.0 L how many moles of gas are presented 

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.

Ithink that the answer is b

Ibelieve the answer is d. titaniumhope my answer has you : )

Answerlimiting reactant;