a. Illustrate that the rate at which shaft work is obtained or needed for a reversible change of state in a closed system at constant internal energy as well as volume is equal to the negative of the product of the temperature as well as the rate of change of the entropy for the system.
b. Illustrate that the rate at which shaft work is obtained or needed for a reversible change of state in a closed system at constant entropy as well as pressure is equal to the rate of change of enthalpy of the system.