Number of Records: 85Record ID: |83

ID	83
Problem No.	2613
Equation	.
Statement	(How much work is required to compress a gas polytropically (index of compression, n = 1.25) from 1 atm and 70 °F to 5 atm. k = 1.6, cP = 4.9675 Btu/(lbmol·°R), cV = 2.98 Btu/(lbmol·°R). Final temperature is 271 °F.)
Ans. (a)	(a). 653 BTU/ibmole
Ans. (b)	(b). 998 BTU/lbmole
Ans. (c)	(c). 1598 BTU/lbmole
Ans. (d)	(d). 599 BTU/lbmole
Subtopic
Topic	thermo
Subject	Mass/Energy Balances and Thermodynamics

| Correct Answer: c | Solution: W = R(T₂ - T₁)/(1 - n)
W = 1.987(271 - 70)/(1 - 1.25) = -1598 BTU/lbmole