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Some Basic Concepts of Chemistry
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11/08/2021 10:13 am
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The density of 3M solution of sodium chloride is 1.252 g mL-1. The molality of the solution will be:
(molar mass, NaCl = 585 g mol-1)
(a) 2.60 m
(b) 2.18 m
(c) 2.79 m
(d) 3.00 m
1 Answer
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11/08/2021 10:16 am
Correct answer: (c) 2.79 m
Explanation:
The relation between molarity (M) and molality (m) is
d = \(M(\frac{1}{m} + \frac{M_2}{1000})\)
\(M_2\) = Mol. mass of solute
On putting value
1.252 = \(3(\frac{1}{m} + \frac{58.5}{1000})\)
on solving m = 2.79