SolutionHard

Question

What is the molecular mass of a non-ionizing solid if 10 g of this solid, when dissolved in 100 g of water forms a solution which freezes at −1.24°C? Kf (H2O) = 1.86°C kg mol−1.

Options

A.250
B.150
C.120
D.75

Solution

$\Delta T_{f} = K_{f}.m \Rightarrow 1.29 = 1.86 \times \frac{10/M}{100/1000}$

$\Rightarrow M = 150$

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