A piston-cylinder device initially contains 100 moles of an ideal gas at T = 353.15 K and P = 0.1 MPa. The ideal gas has CP* = (7/2)R. Heat is added and the gas expands isobarically until its volume is twice its initial volume. How much heat was added?
A. -561. kJ
B. 1 MJ
C. 233. kJ
D. 2 MJ
E. Insufficient information to solve
A. Incorrect. You are explicitly told heat is ADDED. A negative sign indicates heat is being removed or lost from the system. Check your algebra and arithmetic.
B. Correct. Using the ideal gas law twice to find the initial volume and final temperature; the energy balance can be solved for heat added.
C. Incorrect. You probably forgot to convert the initial temperature into kelvins.
D. Incorrect. You probably forgot to convert the final temperature out of kelvins before taking the temperature difference.
E. Incorrect. There is sufficient information stated to solve the problem.
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