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anisotropic

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I am doing a lab writeup and am completely lost.

Help would be appreciated.

**Summary of lab itself:**- Calculated the vapour pressure of chloroform (TCM) across a range of temperatures (using flask apparatus).
- Objective is to determine the heat of vaporization of TCM using the variation of vapour pressure with temperature.

**Other info we are provided:**- Provided the Clausius-Clapeyron relation (lnP = -ΔH
_{v}/RT + C) - "is independent of temperature"
- "C is a constant related to the entropy of vaporization"

**I'm supposed to:**- plot P
_{vapor}vs. T, and determine the boiling temp. - plot lnP
_{vapor}vs. 1/T, and determine ΔH_{vapor}

**My questions:**- How do you calculate boiling point from this data? I am assuming it involves extrapolating and determining at what temperature P
_{vapor}= P_{barometric}? - How do you calculate ΔH
_{vapor}from this data without knowing C? That is, how are lnP_{vapor}and 1/T related to C? (we are not given C and are supposed to determine it from the data)

Help would be appreciated.

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