A cylinder contains 1kg of ammonia. Initially the ammonia is at 180¬¨¬®‚Äö√†√ªC, 2 MPa and is now cooled to saturated vapour at 40¬¨¬®‚Äö√†√ªC, and then further cooled to 20¬¨¬®‚Äö√†√ªC, at which point the quality is 50%. Find the total work for the process, assuming a linear variation of P versus V.

A cylinder contains 1kg of ammonia. Initially the ammonia is at 180¬�

1.	A cylinder contains 1kg of ammonia. Initially the ammonia is at 180¬¨¬®‚Äö√†√ªC, 2 MPa and is now cooled to saturated vapour at 40¬¨¬®‚Äö√†√ªC, and then further cooled to 20¬¨¬®‚Äö√†√ªC, at which point the quality is 50%. Find the total work for the process, assuming a linear variation of P versus V.
A.	-19.4 kJ
B.	-29.4 kJ
C.	-39.4 kJ
D.	-49.4 kJ
Answer» E.

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