A rigid, insulated tank is initially evacuated. The tank is connected with a supply line through which air (assumed to be ideal gas with constant specific heats) passes at 1 MPa, 350 K. The gas then expands in the tank isothermally until the pressure is 0.1 MPa. Which of the following statements is/are true? a) Molar heat capacity is not defined for the process. b) Molar heat capacity is constant. c) Process is isothermal compression. d) Process is isobaric expansion.
