SolutionHard
Question
The molar mass of substance forming 7.0% (by mass) solution in water which freezes at −0.93°C, is (The cryoscopic constant of water is 1.86°C kg mol−1).
Options
A.140 g mol−1
B.150.5 g mol−1
C.160 g mol−1
D.155 g mol−1
Solution
$\Delta T_{f} = K_{f}.m \Rightarrow 0.93 = 1.86 \times \frac{7/M}{93/1000} \Rightarrow M = 150.5$
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