Solutions Question 210
Question: When $ 7.1gm,Na_2SO_4 $ (molecular mass 142) dissolves in $ 100,ml,H_2O $ , the molarity of the solution is [CBSE PMT 1991; MP PET 1993, 95]
Options:
A) 2.0 M
B) 1.0 M
C) 0.5 M
D) 0.05 M
Show Answer
Answer:
Correct Answer: C
Solution:
Molarity $ =\frac{w\times 1000}{ml\text{ wt}\text{. }\times \text{Volume }ml.} $ = $ \frac{7.1\times 1000}{142\times 100}=0.5,M $ .
