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) \[\text{=}\,\frac{\text{mass}\,\text{of}\,\text{solute}\,\text{(in}\,\text{g)}\,\text{ }\!\!\times\!\!\text{ }\,\text{1000}}{\text{molecular}\,\text{weight}\,\text{of}\,\text{solute}\,\text{ }\!\!\times\!\!\text{ }\,\text{massofsolvent(in}\,\text{g)}}\] \[=\frac{2.5\times 1000}{60\times 7.5}=0.555\,\text{mol}\,\text{k}{{\text{g}}^{-1}}\]
You need to login to perform this action.
You will be redirected in
3 sec
