If the relative lowering in vapour pressure for he ethanolic solution containing non volatile solute is 0.02, then the molality of solution will be.(molecular mass of ethanol = 46 gm/mole)
A
0.22m
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B
1.33m
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C
1.09m
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D
0.44m
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Solution
The correct option is D0.44m By Roulits law
Relative lowering vapour pressure= mole fraction of solute