申論題

6. (10%) An ideal gas at 298 K expands isothermally from a pressure of 10 bar to 1 bar.What are the values of w per mole, q per mole, △U, △H, and △S in the following cases? (a) The expansion is reversible. (b) The expansion is free. (c) The gas and its surroundings form an isolated system, and the expansion is reversible. (d) The gas and its surroundings form an isolated system, and the expansion is free. The ideal gas constant R = 8.314 J/K.mol.