Mechanical Engineering Question: help....... im not getting the right answer

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Date Posted: 7/16/2008 3:01:25 AM Status: Live

help....... im not getting the right answer

Course	Textbook	Chapter	Problem
Thermodynamics	Fundamentals of Engineering Thermodynamics (5th) by Moran, Shapiro	3	N/A

Question Details:

Problem 3.72

A system consisting of 2 lb of water vapor, initially at 300°F and occupying a volume of 20 ft³, is compressed isothermally to a volume of 9.05 ft³. The system is then heated at constant volume to a final pressure of 140 lbf/in.² During the isothermal compression there is energy transfer by work of magnitude 90.8 Btu into the system. Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu, for each process.

Q₁₂ = Btu

Q₂₃ = Btu

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help....... im not getting the right answer

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