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Question

The molarity of H2SO4 is 18M. Its density is 1.8gmL1. Hence, molality is :

A
36 m
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B
200 m
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C
500 m
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D
18 m
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Solution

The correct option is C 500 m
The molarity of H2SO4 is 18 M.
Hence, 1 L of H2SO4 corresponds to 18 moles of H2SO4.
The density of H2SO4 is 1.8 g/mL.
Thus 1 L of H2SO4 corresponds to 1800 g or 1.8 kg.
Out of this 18×98=1.764kg corresponds to H2SO4.
Hence, the mass of water is 1.8kg1.764kg=0.036kg.
Hence, the molality of the solution is 180.036=500m.

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