Determine the values of δ u′ , δ h′ , δ s ′ , δ a ′ , and δ g ′ for the following processes (in (c), (d), and (e), show that an absolute value of the entropy is required): a. the four processes in problem 4.1 b. the expansion of 1 mole of an ideal gas at the pressure p and the temperature t into a vacuum to double its volume c. the adiabatic expansion of 1 mole of an ideal gas from p 1 , t 1 to p 2 , t 2 d. the expansion of 1 mole of an ideal gas at constant pressure from v 1 , t 1 to v 2 , t 2 e. the expansion of 1 mole of an ideal gas at constant volume from p 1 , t 1 to p 2 , t 2