A) \[0.565\text{ }mol\text{ }k{{g}^{-1}}\]
B) \[0.656\text{ }mol\text{ }k{{g}^{-1}}\]
C) \[0.556\text{ }mol\text{ }k{{g}^{-1}}\]
D) \[0.665\text{ }mol\text{ }k{{g}^{-1}}\]
Correct Answer: C
Solution :
Molality (m) \[=\frac{mass\text{ }of\text{ }solute\text{ (}ing)\times 1000}{molecular\text{ }weight\text{ }of\text{ }solute\times mass\text{ }of\text{ }solvent\text{ }(ing)}\] \[=\frac{2.5\times 1000}{60\times 75}\] \[=0.555mol\,k{{g}^{-1}}\]
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