Question

A solution of sucrose (molar mass = $342 \,g \,mol^{-1}$) has been prepared by dissolving $68.5 \,g$ of sucrose in $1000 \,g$ of water. The freezing point of the solution obtained will be ($K_f$ for water = $1.86 \, K \, kg \, mol^{-1}$)

• A. $-0.570^{\circ} C$
• B. $-0.372^{\circ} C$
• C. $-0.520^{\circ} C$
• D. $-0.370^{\circ} C$

Answer 1

Answer: (B)

$-0.372^{\circ} C$

Answer 2

$\Delta T_f = K_f \, m$
$\Delta T_f = T_o - T_s$