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n mols of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes:
A to B isothermal (at temperature T)
B to C isobaric
C to A isochoric
Total done=? A) 0
B) nRT[ln2+1/2]
C) nRT(ln2)
D) nRT[ln2-1/2]

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