IIT JEE , AIEEE Forum - Chemistry , Physical Chemistry

sachin_gupta1991

Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.04.

vinyassingh

insufficient data........... for molarity u shud noe the vol. of solution for which density of solution should be known

vinyassingh

other wise we can only solve it using the approximation that ethanol's volume is not considered.
let there be i mole of sol. so moles of ethanol=.04 and moles of water = 1-.04=.96
so mass of water=.96x18=17.28 gm
vol of water=17.28 ml=.01728 lit.
molarity= moles of solute/vol. of sol.
= .04/.01728= 2.31M

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