Problem 5.19

(a) impossible

(b) impossible

(c) reversible

(d) irreversible

Problem 5.36

750 K

Problem 5.45

(a) 21

(b) 55 °C

(c) -3 °C

Problem 5.59

(a) 150 kW

(b) 54.5 kW

Problem 5.77

Q₁₂ /m = 1640.07 kJ/kg,  W₁₂ /m= 190.77 kJ/kg

Q₂₃ /m= 0,  W₂₃ /m= 364.31 kJ/kg

Q₃₄ /m= -1297.7 kJ/kg,  W₃₄ /m= -115.03 kJ/kg

Q₄₁ /m= 0,  W₄₁ /m= -97.68 kJ/kg

h = 20.9%