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Question

Molarity of H2SO4 solution is 18 M. Calculate molality if density of solution is 1.8 g/cc:

A
500
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B
200
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C
98
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D
192
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Solution

The correct option is A 500
Relation between molality (m), molarity (M) and density (d) is: 1m=(dM)(Mb1000)
where Mb is the molar mass of the solute
Molecular mass of H2SO4=98 g
1m=(1.818)(981000)=0.10.098=0.002m=10.002=10002=500
Molality of H2SO4 =500

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