Question
Physical Chemistry Question on Phase equilibria
At constant temperature, 6.40 g of a substance dissolved in 78 g of benzene decreases the vapor pressure of benzene from 0.125 atm to 0.119 atm. The molar mass of the substance is ____g mol-1. (round off to one decimal place)
[Given: Mol. wt. of benzene = 78 g mol-1]
Answer
The correct answer is: 126.0 or 128.0 (approx.)