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JEE Main 2011

Exam: JEE Main
Year: 2011
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2011 · Chemistry · Some Basic Concepts of Chemistry

A 5.2 molal aqueous solution of methyl alcohol, CH_3 OH , is...

A

5.2

molal aqueous solution of methyl alcohol,

\mathrm{CH}_3 \mathrm{OH}

, is supplied. What is the mole fraction of methyl alcohol in the solution?

Options

A $0.190$
B $0.086$
C $0.050$
D $0.100$

Correct answer

B. $0.086$

Step-by-step solution

\begin{aligned} \text{ Molefraction\text{ of } solute }\left(\mathrm{X}_2\right) \text{ in aqueous solution } & =\frac{\mathrm{m}}{\mathrm{m}+\frac{1000}{18}} \\ & =\frac{5.2}{5.2+\frac{1000}{18}}=0.09\end{aligned}

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