JEE Main 2022 · 28 Jun · Shift 1 · Chemistry Q85

← JEE Main 2022 · 28 Jun · Shift 1

ChemistryInteger+4 / -1Question 85 of 90

The vapour pressures of two volatile liquids A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is $\frac x{17}$ . The value of $x$ is ______.

Your answer

Answer and worked solution

Official answer: 14

Partial pressures. $p_A=0.3\times50=15$ Torr, $p_B=0.7\times100=70$ Torr.

Vapour. $y_B=\frac{70}{85}=\frac{14}{17}$ .

Answer: 14

Topics:Raoult's law and vapour pressure

← Previous question Next question →

JEE Main 2022 · 28 Jun · Shift 1, Chemistry question 85