Question

$4.6$ $c{m}^3$ of methyl alcohol is dissolved in $25.2$ g of water. Calculate mole fraction of methyl alcohol.

• A. 0.1232
• B. 0.0759
• C. 0.0932
• D. 0.0562

Answer 1

The correct option is B 0.0759

Let us consider the mole fraction of solute $=\frac{molesofsolute}{totalmoles}$

moles of alcohol $=\frac{weight}{molecularweight}=\frac{3.68}{32}=0.115$

moles of water $=\frac{25.2}{18}=1.4$

mole fraction of alcohol $\frac{0.115}{1.515}=0.0759$