Using the appropriate tables, determine the change in specific entropy between the specified states, in Btu/lb...

Using the appropriate tables, determine the change in specific entropy between the specified states, in Btu/lb · °R.

(a) water, p₁ = 10 lbf/in.², saturated vapor; p₂ = 500 lbf/in.², T₂ = 700°F.
(b) ammonia, p₁ = 140 lbf/in.², T₁ = 160°F; T₂ = -10°F, h₂ = 100 Btu/lb.
(c) air as an ideal gas, T₁ = 80°F, p₁ = 1 atm; T₂ = 340°F, p = 5 atm.
(d) oxygen as an ideal gas, T₁ = T₂ = 520°R, p₁ = 10 atm, p₂ = 9 atm.

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