11. An insulated system with two compartments with ideal gas, and a piston is placed in between the two compartments. Initially, the pressure of the left compartment is greater than the right one, but the piston does not move due to the stoppers. At some point, the stoppers are removed, so the piston is moving towards right. The entire system is isolated but the piston itself allows for heat transfer. You can assume the constant volume heat capacity of this ideal gas 2.5 R, where R is gas constant. You can also ignore the mass and volume of the piston.
