Two mole of a perfect gas undergo the following processes :
(a) a reversible isobaric expansion from (1.0 atm, 20.0 L) to (1.0 atm, 40.0 L).
(b) a reversible isochoric change of state from (1.0 atm, 40.0 L) to (0.5 atm, 40.0 L).
(c) a reversible isothermal compression from (0.5 atm, 40.0 L) to (1.0 atm, 20.0 L).
(i) Sketch with labels each of the processes on the same P - V diagram.
(ii) Calculate the total work ( w ) and the total heat change ( q ) involved in the above processes.
(iii) What will be the values of ΔU , ΔH and ΔS for the overall process? (IIT 2002)