Consider one mole of an ideal gases in a container. The gas starts off
in the state A, which has a volume V0 and a pressure
en2P0. The gas ends up in the state B,
which has a volume of en1V0 and a pressure
P0. The gas undergoes the reversible process as shown in the figure.
What is the change in entropy of the gas. If the change in entropy is
SA-SB = n3R,
what is n3? Note that n1, n2, and
n3 are unitless. R is the gas constant.
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