Question

Calculate the amount of ice that will separate out on cooling a solution containing $50\text{g}$ of ethylene glycol in $200\text{g}$ of water till $-{9.3}^{\circ }C(K_f$ for water $=1.86{\text{Kkgmol}}^{-1})$

• A. $161.29\text{g}$
• B. $38.71\text{g}$
• C. $200\text{g}$
• D. $31.7\text{g}$

Answer 1

The correct option is B $38.71\text{g}$

$\Delta T=\frac{1000\times K_f\times w}{M.M\times W}$
$9.3=\frac{1000\times 1.86\times 50}{62\times W}$
W = 161.29 $g$
Ice seperated = 200 - 161.29
= 38.71$g$