October 6, 2015

Homework Help: Chem.

Posted by Joseph on Wednesday, February 10, 2010 at 6:05pm.

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius.

WHAT is the vapor pressure of ethanol at 18 degrees celcius??

Okay...I dont really get out to solve for it actually.

ln (P2/760 torr)= -38560/8.3145 * (1/291.15 - 1/351.15).

I got ln x/760 = 2.87 ( I must have made an error) and I got stuck right here.

Can someone find me the answer to this??? Answer has to be in 2 sig figs.

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