SolutionHard

Question

The approximate molality of ethylene glycol (C2H6O2) in an aqueous solution which freezes at a temperature not higher than −15°C is (kf of water = 1.86°C kg mol−1)

Options

A.8.06 m
B.0.806 m
C.0.145 m
D.1.5 m

Solution

$\Delta T_{f} = K_{f}.m \Rightarrow 15 = 1.86 \times m \Rightarrow m = 8.06$

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