Problem 2: An insulated horizontal cylinder fitted with a piston contains 1.6mol of helium at 800 kPa. Its volume is 0.005m and the ambient pressure is 100 kPa. The piston does not conduct heat. a) Calculate the work done when the gas is expanded reversibly until the internal pressure is equal to the ambient pressure. b) Calculate the work done when the gas is expanded very suddenly until the internal pressure is equal to the ambient pressure