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Q.

A 5.2 molal aqueous solution of methyl alcohol, CH3OH is supplied. What is the mole fraction of methyl alcohol in the solution ?

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a

1.100

b

0.090

c

0.086

d

0.050

answer is C.

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Detailed Solution

Molality = Moles of solute  Mass of solvent (in kg)                 =5.2molCH3OH1kgH2O          [1kg=1000g]n1CH3OH=5.2,n2H2O=100018=55.56∴ n1+n2=5.20+55.56=60.76mol∴    xCH3OH=n1n1+n2=5.260.76=0.086
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