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Question

Find the mole fraction of water present in 3 molal aqueous solution of NaOH.

A
0.65
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B
0.95
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C
0.32
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D
1.68
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Solution

The correct option is B 0.95
3 molal aqueos solution means 3 moles of NaOH (solute) is present in 1000 g of water (solvent)
Number of moles of water =100018=55.56
Mole fraction (solvent) =moles of solventmoles of solute + moles of solvent
Mole fraction of water =55.5655.56+3=55.5658.56=0.95

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