d) To calculate air pressure, the volume occupied by air is assumed constant. Why is this incorrect? Explain how the vapor pressure calculated and the resulting Clausius-Claperon plot are affected?

the volume occupied by air is not constant because as we add ethanol in it it will keep decreasing.

vapor pressure calculated and clausius-Claperon plot are affected because volume and vapor pressure are directly proportional.

Explanation:

by charle's law volume and temperature are directly proportional and vapor pressure is directly proportional to temperature thus volume and vapor pressure are also directly proportional by this relation