Homework Help: CHEMISTRY

Posted by THOMAS on Friday, December 9, 2011 at 6:16pm.

I know this question is already on here but the answer wasn't helpful to me.

Liquid Sodium can be used as a heat transfer fluid. Its vapor pressure is 40.0 torr at 633 C and 400.0 torr at 823 C. Calculate its heat of vaporization.

CHEMISTRY - DrBob222, Friday, December 9, 2011 at 7:06pm
I looked and did not see another post of this problem; therefore, I don't know what was confusing you. Wouldn't you use the Clausius-Clapeyron equation?
CHEMISTRY - THOMAS, Saturday, December 10, 2011 at 12:37pm
I'm just not sure how to apply it to this problem.
CHEMISTRY - DrBob222, Saturday, December 10, 2011 at 3:40pm
To apply it you simply plug in the numbers, punch them into your calculator, turn the crank and out comes the answers.
ln(p2/p1) = [DHvap/R](1/T1 - 1/T2)
You have p1 @ T1 and p2 @ T2. R is 8.314, solve for DHvap. The unit for DHvap will be joules.

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