Question

One mole of ethylene at 1 bar and 25C is placed inside a frictionless piston-cylinder device. The gas is then subjected to a two-step process: (1) by keeping the piston fixed with a lacking mechanism, 25KJ of heat is added via an electrical heater; and (2)the locking mechanism is then released and 15KJ of heat is removed. The second step of the process takes placed at constant pressure. Assuming ethylene is an ideal gas, determine the following:
(a) The temperature and prssure of the gas at the end of the first step
(b) The temperature and pressure of the gas at the end of the second step
(c) W, delta U and delta H of each step
(d) W, delta U and delta H of the entire process

Answer 1