A 15.0 L tank of gas is contained at a high pressure of 8.20 * 10^4 torr. The tank is opened and the gas expands into an empty chamber with a volume of 6.00 *10^4 L. Calculate the new pressure of the gas

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.