A small, well-insulated piston and cylinder assembly (pictured below) contains an ideal gas at 15.13 bar (1,513 kPa) and 294 K. A mechanical lock (pin A) initially prevents the piston from moving. The initial volume of the gas is 5.67x10-3 m3. Pin A is released, allowing the gas to expand until the piston reaches pin B. At this point, the volume of the gas has doubled. There are indications that there is considerable friction during the motion of the piston.

(30 pts) A small, well-insulated piston and cylinder assembly (pictured below) contains an ideal gas at 15.13 bar (1,513 kPa) and 294K. A mechanical lock (pin A) initially prevents the piston from moving. The initial volume of the gas is 5.67103m3. Pin A is released, allowing the gas to expand until the piston reaches pin B. At this point, the volume of the gas has doubled. There are indications that there is considerable friction during the motion of the piston. Estimate the temperature and pressure of the gas after the expansion. Cp=20.93J/molK for the gas. Consider the heat capacity of the piston and cylinder to be negligible. The atmosphere outside the cylinder has an atmospheric pressure of 101.325kPa. R=8.314(m3Pa)/(molK)