- #1
Telemachus
- 835
- 30
Homework Statement
Hi there. I was trying to solve this problem from Callen. It says: In the vecinity of the triple point the vapor pressure of liquid ammonia (in Pascals) is rerpesented by:
[tex]\ln P=24.38-\frac{3063}{T}[/tex]
This is the equation of the liquid-vapor boundary curve in a P-T diagram. Similarly, the vapor pressure of solid ammonia is
[tex]\ln P=27.92-\frac{3754}{T}[/tex]
a) What are the temperature and pressure at the triple point?
b) what is the latent heat of fusion at the triple point?
Homework Equations
I think a relevant equation is
[tex]d(ln P)=-\frac{\Delta h}{R}d\left ( \frac{1}{T} \right ) [/tex]
The Attempt at a Solution
Well, I think I've solved a)
At the triple point we have:
[tex]\ln P=27.92-\frac{3754}{T}=24.38-\frac{3063}{T}[/tex]
Then [tex]T=195.19[/tex]
And [tex]P=5928.9[/tex]
I don't know how to solve b), I think I should work with the equation I've posted in Relevant equations.