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Question

A solution of 36.5% HCl by mass has a density of 1.20 g mL−1. The molarity and normality of the solution respectively are:

A
12 M, 12 N
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B
b. 6 M, 6 N
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C
6 M,12 N
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D
12 M,6 N
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Solution

The correct option is A 12 M, 12 N
Let the total mass of solution be 100 g.
36.5% by mass means 36.5 g of HCl is present in 100 g of the solution.
Moles of HCl =36.536.5=1 mol

Density = massvolume; volume is calculated as 1001.2 mL

Molarity = moles of solutetotal volume of solution in mL×1000=11001.2×1000=12 M

Since n-factor of HCl is 1, normality = molarity

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