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Question

Find the molarity and molality of a 15% (w/w) H2SO4 solution.
(Density of the solution is 1.10 g/mL)

A
1.53 M, 1.64 m
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B
1.68 M, 1.68 m
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C
1.80 M 1.68 m
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D
1.68 M 1.80 m
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Solution

The correct option is D 1.68 M 1.80 m
15% (w/w) H2SO4 15 g H2SO4 in 100 g of solution
150 g H2SO4 in 1000 g solution
Volume of the solution=Massdensity=10001.10=909 mLMolarity=Number of moles of Solutevolume of solution in L
150×100098×909=1.68 MMass of solvent=1000150=850 gMolality=Number of moles of soluteMass of solvent in kg
150×100098×850=1.80 m

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