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  • The vapour pressure of pure benzene is of <img alt="\mathrm{Hg}" src="https://e

The vapour pressure of pure benzene is 456.82 \mathrm{~mm} of \mathrm{Hg} and the vapour pressure of solution of a solute in benzene at the same temperature is 452.72 \mathrm{~mm} of \mathrm{Hg}.What is molality of the solution

Option: 1

0.826


Option: 2

0.114


Option: 3

0.236


Option: 4

0.116


Answers (1)

best_answer

\mathrm{P=P_{0} X_{1} }

\mathrm{452.72=456.82 \, X_{1} }

\mathrm{ X_{1}= 0.991 }

\mathrm{X_{2}=1-X_{1} }

\mathrm{X_{2}=1-0.991 }

\mathrm{X_{2}=0.009 }

\mathrm{ \text { Molality }=\frac{0.009}{0.991 \times 78} \times 1000 }
                     

\mathrm{=0.116 }

Posted by

manish painkra

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