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I have a doubt, kindly clarify. A 5.2 molal aqueous solution of methyl alcohol, CH3OH, is supplied. What is the mole fraction of methyl alcohol in the solution ?

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

  • Option 1)

    0.100

  • Option 2)

    0.190

  • Option 3)

    0.086

  • Option 4)

    0.050

 
Answers (1)
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As we learnt in

Molality -

Molality = \frac{Moles \: of \: solute}{Mass \, \: o\! f\: solution(Kg)}

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Mole Fraction -

\dpi{100} Mole\: Fraction= \frac{Moles\: o\! f\: solute}{Moles\: o\! f solute+Moles\: o\! f solvent}

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 Let the Mass of water is 1 Kg so moles of CH3OH is 5.2

\chi_{solute}=\frac{5.2}{5.2+\frac{1000}{18}}=0.086

Correct option is 3.

 

 


Option 1)

0.100

This is an incorrect option.

Option 2)

0.190

This is an incorrect option.

Option 3)

0.086

This is the correct option.

Option 4)

0.050

This is an incorrect option.

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