Using the appropriate tables, determine the change in specific entropy between the specified states, in Btu/lb ·°R. (a) water, p = 10 lbf/in. , saturated vapor; p = 500 lbf/in. , T = 1000°F. (b) ammonia, p = 140 lbf/in. , T = 160°F; T = -10°F, h = 100 Btu/lb. (c) air as an ideal gas, T = 80°F, p = 1 atm; T = 340°F, p = 25 atm. (d) oxygen as an ideal gas, T = T = 520°R, p = 10 atm, p = 1 atm.

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