Textbook Problem

When a gas follows path 123 on the PV diagram in Figure P 12.66, 418 J of energy flows into the system by heat and −167J of work is done on the gas. (a) What is the change in the internal energy of the system? (b) How much energy Q flows into the system if the gas follows path 143? The work done on the gas along this path is −63.0 J. What net work would be done on or by the system if the system followed (c) path 12341 and (d) path 14321? (e) What is the change in internal energy of the system in the processes described in parts (c) and (d)?

Figure P12.66