1. The frictionless piston/cylinder assembly is located vertically in the gravitational field. The mass of the piston face may be assumed to be negligible, and the heat transfer with the surroundings may be taken as reversible, with both system and the surroundings always at 300K. The area of the piston face is 0.030m2, and volume of 0.025m3. What is the minimum weight required to compress the 1 mole of gas isothermally in one step to 0.0025m3 ? Ans. 3052kg