Vapor pressure question
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Vapor pressure question

[From: ] [author: ] [Date: 11-07-05] [Hit: ]
but then I only have 4 out of the 6 unknowns, delta H, T2, T1 and R. If this is the correct method, then how do I find P1?......
The enthalpy of vaporization of acetone is 32.0kJ/mol. The normal boiling point of acetone is 56.5 degrees Celcius. What is the vapor pressure of acetone at 25 degrees Celcius?

Ok I think I need to use the Clausius-Clapeyron equation:
but then I only have 4 out of the 6 unknowns, delta H, T2, T1 and R. If this is the correct method, then how do I find P1?

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"The normal boiling point of acetone is 56.5 degrees Celcius."

At this point, the vapor pressure equals the ambient pressure.In this case, normal indicates 1 atm of pressure. So, at 56.5 C, the vapor pressure of the acetone is 760 mmHg (or 1.00 atm or 101.325 kPa, whichever set of pressure units you are using).

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Think about the definition of NORMAL boiling point -- It is the saturation temperature at 1 atm pressure.
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