Posted by **Christina** on Thursday, March 15, 2012 at 6:30pm.

The boiling point of ethanol is 78.5C and delta H vap = 40.5kJ/mol. Calculate the vapor pressure (in torr) of ethanol at 0.0C ?

- Chemistry -
**Christina**, Thursday, March 15, 2012 at 6:34pm
I know that I am close to the answer using this formula with plugged in information:

ln p2/760= 40500/8.314(1/273-1/351.1)

Just not sure what I am doing wrong. Is someone could assist me that would be greatly appreciated! thanks :)

- Chemistry -
**DrBob222**, Thursday, March 15, 2012 at 8:35pm
I didn't go through it but it appears to me you didn't convert T2 properly.

273.15 + 78.5 = 351.65. Try that. If it doesn't work let me know and I'll go through the math. BUT if would help if you posted you work and I looked for the error. It's better that way.

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