How many moles are in 159 Liters of He2F?
O 5 moles
O 7 moles
O 9 moles

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.