Calculate the change in entropy that occurs in the system when 1.90 mol of methanol (ch3oh) vaporizes from a liquid to a gas at its boiling point (64.6∘c).for methanol, δhvap = 35.21 kj/mol.

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.