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Going for point B to point C has a change in both pressure and volume, but the answer seems to only account for the work done based on the change in pressure. Yet it states both equations. Why do we not calculate the work done by change in volume?
What equation we use is based on if the equation is reversible or not. If it is reversible we use the equation with R in it and if it is irreversible we use the equation with w=-pextdeltaV
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