Question

The amount of ice that will separate out on cooling a solution containing 50 g of ethylene glycol in 200 g water to $-{9.3}^{o}C$ is:

$[K_f=1.86Kmo{l}^{-1}]$

• A. $38.71$ g
• B. $38.71$ mg
• C. $42$ g
• D. $42$ mg

Answer 1

Answer: (A)

$38.71$ g

$\Delta T=\frac{1000\times K_f\times w}{W\times m}$

$9.3=\frac{1000\times 1.86\times 50}{62\times W}$

$\therefore W=161.29$

$\therefore$ Ice separated $=200-161.29=38.71g$.

Hence, the correct option is $A$