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)

As we learned in concept

Mole Fraction -

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

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

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