Question

An aqueous solution which contains 42% by weight (w/W) of a volatile liquid "A" of molar mass of 140 g/mol, has a vapour pressure of 2141.4 mm of Hg at 37°C. What is the vapour pressure of the pure liquid "A"? Vapour pressure of water at 37°C is 2019.1 mm.

• A. 3457.6 mm
• B. 293 mm
• C. 2356.4 mm
• D. 2519.2 mm

Hint:

To calculate the vapour pressure of a pure component in a solution, use Raoult's law. This law relates the vapour pressure of a solution to the mole fraction of the solute and the vapour pressures of the pure components.

Answer 1

The Correct Option is A