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 $
