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CBSE Class 11-science Answered

Calculate the molarity of a soln of ethanol in watr in wich d mole fractn of etanol is 0.040??
Asked by | 19 Apr, 2008, 11:43: PM
answered-by-expert Expert Answer

Dear Student,

The question can be solved by following approach. Let the number of moles of water be x.Let the number of moles of ethanol are y.

Then:

y/(x+y) = 0.04

or

25 y= x+ y

or

y = x/24

Now weight of water= 18 x grams

using Volume =Mass/Density

Volume of water = 18 x /1000

Hence molarity of solution is :

y/Volume of water=(x 1000) /(2418 x)=2.315 M 

Answered by | 14 Jun, 2008, 01:28: AM
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