Q.

3.0 molal NaOH solution has density of 1.110 g/ml.  The molarity of the solution is ----M

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a

2.9732

b

3.05

c

3.64

d

3.0504

answer is A.

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Detailed Solution

3molal means 3moles of solute per Kg of solvent(water)Weight of solute = 3 x Molecular wt. = 3 x 40 = 120 gTotal weight of solution = 1000+120 = 1120gVolume of solution = massdensity=11201.110Molarity =n×1000V=3×1000×1.1101120=2.9732M
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3.0 molal NaOH solution has density of 1.110 g/ml.  The molarity of the solution is ----M