Solutions Question 301

Question: A solution is prepared by dissolving $ 10gNaOH $ in 1250 mL of a solvent of density 0.8 g/mL. The molality of the solution in mol $ k{g^{-1}} $ is

Options:

A) 0.25

B) 0.2

C) 0.008

D) 0.0064

Show Answer

Answer:

Correct Answer: A

Solution:

Given w= 10 g, Mol. mass =40 g Weight of solvent $ =1250\times 0.8g=10000g $ =1 kg
$ \therefore molality=\frac{10}{40\times 1}=0.25m $



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