When a gas follows path 123 on the PV diagram in the figure below, 425 J of energy flows into the system by heat and -175 J of work is done on the gas. 3 4 V (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. (c) What net work would be done on the system if the system followed path 12341? (d) What net work would be done on the system if the system followed path 14321? (e) What is the change in internal energy of the system in the processes described in parts (c) and (d)?