A sample containing 2.000 mol of helium gas originalyy at 298.15 K and 1.000 bar is coled to its normal boilding temperature of 4K, condensed to a liquid and then cooled further to 2K, where it undergoes another phase transition to a second liquid form, called liquid helium II. A beam of laser light suddenly helium II. A beam of laser light suddenly vaporizes this liquid phase, and the helium is brought to a temperature of 298.15K and a pressure of 0.500 bar. the entropy change for the above process is