Problem 6.4

(a) -1.43749 Btu/lb°R

(b) 0.1056 Btu/lb°R

(c) 0.18405 Btu/lb°R

(d) -0.25435 Btu/lb°R

Problem 6.20

Q₁₂ = 0, W₁₂ = -254.25 kJ/kg

Q₂₃ = -301.51 kJ/kg, W₂₃ = -277.61 kJ/kg

Problem 6.44

(a) W = -1872.9 Btu

(b) s = 2.5265 Btu/°R

Problem 6.81

(a) s_cv/m = 0.1247 kJ/kg-K (OK)

(b) s_cv/m = -0.214 kJ/kg-K (Not OK)

Problem 6.103

s_cv = -1.86 Btu/h-°R (Not Possible)

Problem 6.145

(a) 94.7 %

(b) 0.465 kW/K