# Vapor pressure and boiling point solution

**Discipline:** Physics

**Type of Paper:** Question-Answer

**Academic Level:** High school

**Paper Format:** APA

**Pages:**1

**Words:**275

Question

# This is a
question about finding boiling point of water with the vapor pressure formula.
The question states

In Breckenridge, Colorado, the typical atmospheric pressure is 520 torr. what
is the boiling point of water (delta Hvap = 40.7 kJ/mol) in Breckenridge?

Using the vapor pressure
formula

Do we pick the
ln(P1/P2)=deltaHvap/R (1/T2-1/T1) or do we use the ln(P2/P1)=
deltaHvap/R(1/T1-1/T2) and can you tell me why we pick it? I believe it is the
second one but I am not sure why?

ln(52f0.torr/760.torr = 40.7
x 10 ^3 J/mol/ 8.3145 J/K mol ( 1/373K - 1/T2),

out of this I got -7.75 x 10
^ -5 = 2.68 x 10^3 - 1/T2

How do I get 1/T2 = 2.76 x 10
^ -3 from the last two numbers? I am not sure where 2.76 x 10 ^ -3 is coming
from? I have tried to manipulate the numbers around, and cannot see how they
are coming up with this number? From here getting the answer 89 degrees
celcius, I understand.

Tthank-you very much.

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