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Question

The mole fraction of methanol in 4.5 molal aqueous solution is:

A
0.250
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B
0.125
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C
0.100
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D
0.075
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E
0.055
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Solution

The correct option is D 0.075
Mole fraction, x=wmwm+WM
(where, w and m represent the mass and molar mass of solute and W and M represent the mass and molar mass of solvent.)

1x=wm+WMwm

1x=1+W×mM×w×10001000

1x=1+1000M×m (Molality,m=w×1000m×W)

=1+100018×4.5 (MolarmassofH2O=18gmol1)

=1+100081

=108181=13.34

x=113.34=0.075

Hence, option D is correct.

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