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The vapour pressure of pure benzene at 5...

The vapour pressure of pure benzene at `50^(@)` is `268 mm` of `Hg`. How many moles of non-volatile solute per mole of benzene are required to prepare a solution of benzene having a vapour pressure of `16.0 mm` of `Hg` at `50^(@)C`?

A

0.377

B

0.605

C

0.623

D

0.395

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(P_("benzene")^@=268 "torr"),(" "P_(sol)=167 "torr"):}}=chi_B=(268-167)/268=0.377,chi_B=n_B/(n_A+n_B)`
`rArr n_B/n_A=0.605`
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