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For W=-nRTln v2/v1, we account for the infinitesimal and consistent change in expansion of the system. In class, we saw the curve Professor Lavelle drew whose shape was that of exponential decay. This comes from the use of the natural log. However, the important aspect to understand is that such a curve like that increases the space beneath the curve, and for that reason shows an increase in the change of enthalpy. For w=-p * delta V, we have only the change of space given by delta v, and with constant pressure, the space becomes fixed and therefore represents a fixed rectangle as Professor Lavelle also drew.
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