When 6.30 X 10 ^5 J of heat is added to a gas enclosed in a fitted cylinder with a light, frictionless piston maintained at atmospheric pressure, it is observed that the volume increases from 2.2 m^3 to 4.1 m^3. Calculate a) the work done by the gas and b) the change in the internal energy of the gas. c) Graph this process into a PV diagram