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CBSE Class 11-science Answered

what is the mole fraction of alcohol in 10% of alcohol w/w in water ?
Asked by abhishek19362771 | 08 Apr, 2020, 03:48: PM
Expert Answer
Given:
 
10% of alcohol in water
 
Means 10 gm of alcohol in 100 gm of solution.
 
Mass of water = 90 gm
 
No. of moles of water =90/18
                                = 5 mol
 
No. of moles of ethyl alcohol = 10/46
                                          = 0.21 mol
 
Mole fraction of alcohol =
 
equals fraction numerator No. space of space moles space of space alcohol over denominator No. space of space moles space of space acohol space plus space No. space of space moles space of space water end fraction

equals fraction numerator 0.21 over denominator 0.21 plus 5 end fraction
= 0.04
Answered by Varsha | 08 Apr, 2020, 07:52: PM

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