- #1
priscilla98
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Homework Statement
Using the following vapor pressure data solve for the heat of vaporization for substance x.
T VP
20 100
30 175
40 325
Homework Equations
ln (P1/P2) = -Heat of vap/RT (1/T2 - 1/T1)
The Attempt at a Solution
I know the answer is 46.7 kJ/mol. But I'm getting a different answer.
ln (175/100) = x/(8.314) (1/303 - 1/298)
x = 41305 J
x = 41.3 kJ/mol
I'm always getting an answer close to 46.7 kJ/mol but not the exact answer.
Any help is greatly appreciated, thanks