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Why is the graph showing the relationship between vapor pressure and temperature exponential and not linear?

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Why is the graph showing the relationship between vapor pressure and temperature exponential and not linear?

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  1. Because vapor pressure is proportional to exp(-DH/RT), where T is Kelvin temp.  A plot of ln(p) vs. 1/T is linear.  Google the Clausius Clapeyron equation, or look it up in your book.

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