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CBSE Class 12-science Answered

find out mole fraction of methanol in 5.2 m solution of methanol
Asked by ranjanasvadvekar | 03 Jun, 2020, 12:43: PM
answered-by-expert Expert Answer
Given:
 
Molality = 5.2 m
 
5.2 m solution means 5.2 moles in 1 kg of solvent.
 
So, no of moles of water = 
 
fraction numerator Wt space of space water over denominator Molecular space wt space of space water end fraction

fraction numerator 1000 space gm over denominator 18 end fraction
 
= 55.55 mol
 
 
We know,
 
Mole fraction =
 
 fraction numerator No. space of space moles space of space methanol over denominator No. space of space moles space of space methanol plus No. space of space moles space of space water end fraction


equals fraction numerator 5.2 over denominator 5.2 plus 55.55 end fraction

equals space 0.085
 
Mole fraction of methanol is 0.085
Answered by Varsha | 03 Jun, 2020, 02:24: PM
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