The gas in a cylinder is initially at point A, where the pressure is 1.6 x 10^5

Question

The gas in a cylinder is initially at point A, where the pressure is 1.6 x 10^5 Pa and the volume is 30 L. The gas is taken through the following processes:
1) isochoric cooling from A to B (pressure 6 x 10^4 Pa);
2) isobaric expansion from B to C (volume 45 L).
Sketch the processes on a pV-diagram, and
a) find the work done by the gas in the two processes;
b) If the heat released by the gas is 450 J in the process AB and the heat absorbed by the gas is 1800 J in the process BC, find the changes of its internal energy in these two processes.

Explanation / Answer

a) For isochoric process,V=0 and work done is zero.

Work done for isobaric process=PV=6*104*(45-30)*10-3=900J

b)Q=1800-450=1350J

U=Q-W=450J

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