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Questions  >>  CBSE XII  >>  Chemistry  >>  Solutions
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Q)

Calculate the mole fraction of ethylene glycol $(C_2H_6O_2)$ in a solution containing 20% of $C_2H_6O_2$ by mass.

$\begin{array}{1 1}0.068\\0.078\\0.058\\0.048\end{array} $

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A)
Let total mass of solution =100g
$\therefore$ mass of ethylene glycol $W_2=20g$
Mass of solvent (water) $W_1=80g$
Molar mass of $[C_2H_6O_2] M_1=12\times 2+6\times 16\times 2$
$\Rightarrow 24+6+32$
$\Rightarrow 62g mol^{-1}$
Molar mass of water $(H_2O) M_2=1\times 2+16$
$\Rightarrow 18g mol^{-1}$
Molar of water $n_1=\large\frac{W_1}{M_1}=\frac{80}{18}$$=4.44$ mole
Moles of $C_2H_6O_2$,
$n_2=\large\frac{W_2}{M_2}=\frac{20}{62}$
$\Rightarrow 0.322$ mol
Mole fraction of $C_2H_6O_2=\large\frac{n_2}{n_1+n_2}$
$\Rightarrow \large\frac{0.322}{4.44+0.322}$
$\Rightarrow 0.068$
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