Posted here are comments and/or corrections for solutions provided in the Instructor's Manual.

Problem 1.13 (b) F_grav = 98.1 N

Problem 2.27 W₁₂/m, W₁₈/m, and W₂₃/m all have units of kJ/kg.

Problem 3.51 Note that this solution is for refrigerant 12.

Problem 3.97 On the second page of this solution, the molecular weight is given incorrectly as 17.04. The final results are correct.

Problem 4.55 These data are not well selected and give a physically unreasonable result.

Problem 4.73 Note that this solution is for refrigerant 12.

Problem 6.23 (a) s₂-s₁ = -0.4979 kJ/kg·K

Problem 6.121 (b) p₂ = 1.78 bar

Problem 10.25

Problem 11.3 Revise 360°F to 360°C

Problem 12.95 Sign error:
sample calculations:

Problem 13.66 Sign error. Three lins above the answer line giving T₂ 2928 K, the left side of the equation should read ... .