If $K_b$ for water is 0.512 K·kg/mol, the boiling point elevation of a 0.50 molal aqueous urea solution is:
A0.128 K
B0.256 K
C0.512 K
D1.024 K
Answer & Solution
Correct answer: B. 0.256 K
$\Delta T_b = K_b m = 0.512 \times 0.50 = 0.256$ K. (Urea is a non-electrolyte, so van't Hoff factor i = 1.)
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