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Question

Sulphuric acid is 95.8% by mass. Calculate mole fraction of H2SO4 of density 1.91 cm3. (H=1,S=32,O=16).

A
0.895
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B
0.2982
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C
0.2056
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D
0.8075
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Solution

The correct option is D 0.8075
For mole Fraction:-
No. of moles of H2SO4=95.898=0.9776
No. of Moles of H2O=4.218=0.2333
Mole fraction of H2SO4=moles of H2SO4Total moles=0.97760.9776+0.2333=0.8073

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