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Calculating vapor pressure using temperature

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Please explain as ELEMENTARY as possible.

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A liquid has a heat of vaporization of 35.5kJ/mol and a boiling point of 122 EC at 1 atm. What is its vapor pressure at 109EC?

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A liquid has a heat of vaporization of 35.5kJ/mol and a boiling point of 122 EC at 1 atm. What is its vapor pressure at 109EC?

I am thinking that differential equations are out of the question so I can't derive this expression. ...

Solution Summary

This solution is provided in 185 words. It uses Gibbs Free Energy and how this relates to entropy, as well as the Clausius-Clapeyron equation, to solve for vapor pressure.

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