Question

The vapor pressure of a compound in a liquid phase is given by ln p* = 21 – 2800/T, and in solid phase it is given by ln p* = 28 – 3500/T, what is the sublimation temperature of the compound?

(a) 100 K

(b) 120 K

(c) 150 K

(d) 200 K

I got this question in final exam.

My question comes from Modeling and Predicting Vapor Pressure in division Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

Answer 1

The correct option is (a) 100 K

For explanation: At sublimation point pressure and temperature of both the phases will be same, => 21 – 2800/T = 28 – 3500/T, => T = 100 K.