(b) How can you use change in Helmholtz free energy to determine the spontaneity of the process? (c) The physical meanin

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(b) How can you use change in Helmholtz free energy to determine
the spontaneity of the process?
(c) The physical meaning of change in Gibbs free energy
(G) is the maximum work that the system can do in a constant
temperature and pressure process. What is the physical meaning of
the change in Helmholtz free energy?
(d) Calculate the change in Helmholtz free energy, ΔA (in kJ),
when one mole of an ideal gas at 298K and 25 atm is expanded
isothermally and reversibly to a pressure of 13.5 atm