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Question

The molality of pure H2SO4 liquid is:

(Assume density of pure H2SO4 liquid to be 1.25 g ml1)

A
10.2
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B
12.75
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C
1
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D
122.5
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Solution

The correct option is A 10.2
Let volume= 1L, density= 1.25g/ml
Mass of H2SO4=1.25Kg=1250g
Moles of H2SO4=125098=12.75
Molality= Moles of H2SO4Mass of H2SO4(in kg)=12.751.25=10.2m

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