The density of 2M NaCl solution is 1.117 g ml-1. The molality of the solution is (A)1 m(B)1.5 m(C)1.8 m(D)2 m
Answers
Answered by
21
Molarity= 2M
Molar mass of NaCl= 58.5
M= mass of solute/ molar mass of solute x volume
mass = 2 x 58.5
= 117g
density = 1.117 = mass/ volume
mass = density x volume
= 1.117 x 1000
= 1117 g
mass of solvent = mass of solution - mass of solute
= 1117- 117
= 1000g
molarity (m) = mass of solute /molar mass of solute x mass of solvent
= 117 x 1000/58.5 x 1000kg
= 2m
Molar mass of NaCl= 58.5
M= mass of solute/ molar mass of solute x volume
mass = 2 x 58.5
= 117g
density = 1.117 = mass/ volume
mass = density x volume
= 1.117 x 1000
= 1117 g
mass of solvent = mass of solution - mass of solute
= 1117- 117
= 1000g
molarity (m) = mass of solute /molar mass of solute x mass of solvent
= 117 x 1000/58.5 x 1000kg
= 2m
Answered by
8
Answer: The correct answer is Option D.
Explanation:
The equation which shows the relationship between density, molarity and molality is given by:
where,
m = molality of the solution
M = molarity of the solution
d = Density of the solution
= Molar mass of the solute i.e. NaCl
We are given:
Putting values in above equation, we get:
Hence, the correct answer is Option D.
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