A) 128.4
B) 156.6
C) 178.9
D) 232.4
Correct Answer: C
Solution :
Key Idea: The molecular mass of a substance is calculated by following relationship \[M=\frac{{{K}_{f}}\times w\times 1000}{\Delta {{T}_{f}}\times W}\] Where, M = molecular weight of solute = ? \[{{K}_{f}}=\]molal depression constant \[={{5.12}^{o}}C\text{ }mo{{l}^{-1}}\] w = weight of solute = 0.44 g \[\Delta {{T}_{f}}={{0.567}^{o}}C\] \[w=22.2g\] \[\therefore \] \[M=\frac{1000\times 5.12\times 0.44}{0.567\times 22.2}=178.9\]You need to login to perform this action.
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