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1. A perfect gas has a value of R = 58. 8 ft.lb/lb.R and k=1.26. If 20 Btu are added to 5 lb of this gas at a constant volume when the initial temperature is 90 deg. Fahrenheit, find (a) T2 (b) ∆H, © ∆S, (d) ∆U, and (e) work for a nonflow process.
Book Answer: (a) 563.8 (b) 25.27 Btu © 0.036 Btu / (d) 20.06 Btu

2. A reversible, nonflow, constant volume process decreases the internal energy by 316.5kJ for 2.268 kg of a gas for which R=430 J/kg. K and k = 1.35. For the process, determine (a) the work, (b) Q, © ∆S. The initial temperature is 204.4 .
Book Answer (a) 0; (b) – 316.5 kJ; © – 0.7572 kJ/ .

3. A 10-ft^3 vessel of hydrogen at a pressure of 305 psia is vigorously stirred by paddles until the pressure becomes 400 psia. Determine (a) ∆U; (b) W. No heat is transferred, cv = 2.434 Btu/lb.R
Book Answer (a) 434 Btu (b) – 434 Btu

4. Three pounds of a perfect gas with R = 38 ft.lb/lb.R and k = 1.667 have 300 Btu of heat added during the reversible nonflow constant pressure change of state. The initial temperature is 100 . Determine (a) final temperature, (b) ∆H, © W, (d) ∆U and (e) ∆S.
Book Answer (a) 919 © 120 Btu (d) 180 Btu (e) 0.3301 Btu/ .

5. While the pressure remains constant at 689.5 kPa the volume of a system of air changes from 0. 567 m^3 to 0.283 m^3. What are (a) ∆U; (b) ∆H; © Q; (d) ∆S? (e) if the process is nonflow and internally reversible, what is work?
Answer (a) – 490.2 kJ (b) -686.3 kJ © – 686.3 kJ (d) – 0.6974 kJ/kg.K; (e) – 195.8 kJ