An ideal gas is in an initial state of 35 C, 150 kPa and 0.2 m3. It undergoes a quasi-static isothermal expansion until its pressure is 95 kPa.
(a) Draw the PV diagram to illustrate the process.
(b) Find the work done by the gas.
(c) Find the heat added to the gas.
(d) Explain where this heat comes from.