Question

If the pressure of a gas at 27^oC is 15 mm Hg, what will be its pressure at 127^oC, use B = 5 X 10^3, C = 0, T is in kelvin and P is in mm Hg?

(a) 579 mm Hg

(b) 775 mm Hg

(c) 961 mm Hg

(d) 999 mm Hg

I had been asked this question during an online interview.

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

Answer 1

Right option is (c) 961 mm Hg

The best explanation: ln P1/P2 = B (1/T2 – 1/T1), => ln 15/P2 = 5 X 10^3 (1/400 – 1/300), P2 = 961 mm Hg.