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I have a doubt, kindly clarify. The mole fraction of 20% (mass/mass) Kl (aq) is (density of kl(aq)= 1.202gml-1)

The mole fraction of 20% (mass/mass) Kl (aq) is (density of kl(aq)= 1.202gml-1)

  • Option 1)

    0.0463

  • Option 2)

    0.05

  • Option 3)

    0.0263

  • Option 4)

    0.03

 
Answers (1)
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As we learned in concept

Mole Fraction -

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

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20\%  Mass / mass KI(aq) means 20g of  KI in 100g of solution.

20g of KI in 80g of water

Moles\: of\: KI =\frac{20}{166}=0.12\:mol

Moles\: of\: H_{2}O =\frac{80}{18}=4.44\:mol

Mole \: fraction\ of\ KI =\frac{0.12}{0.12+4.44}

=0.0263

 


Option 1)

0.0463

Option is incorrect

Option 2)

0.05

Option is incorrect

Option 3)

0.0263

Option is correct

Option 4)

0.03

Option is incorrect

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