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## Homework Statement

Given the following data, determine the heat of vaporization and normal boiling point of ammonia

Temp (K):

200

210

220

230

235

Pressure (respectively)(torr):

65.3

134.3

255.7

456.0

597.0

## Homework Equations

ln(p2/p1)=-deltaH/R(1/t2-1/t1)

## The Attempt at a Solution

I have calculated using the first two sets of data that deltaH should be 25.179kJ/mol. The books answer within 1kJ/mol, so I'm assuming that they just used different data to come up with it. Anyways, I'm having a problem on the second part of the question where it asks to come up with a normal boiling point. The normal boiling point is when the vapor pressure equals the external pressure, right? But I have no variable in this equation that will give me the normal boiling point. Do I use this equation for both portions to the question? I'm confused. I should be able to solve the problem, just need a little boost please.