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Calculate the mole fraction of ethanol and water in a sample of rectified spirit which contains 46 % ethanol by mass
Number of moles of ethanol is 46/46 i.e 1Number moles of water is 54/18 i.e 3
mole fraction of ethanol = no.of moles of ethanol / total number of moles
Molefraction=n1(numberofmolesofsolute)n1+n2(Numberofmolesofsolute+numberofmolesofsolvent)
Nown1(molesofethanol)
Molefractionofethanol=NumberofmolesofethanolTotalnumberofmoles=13=0.33
Molefractionofwater=1−molefractionofethanol
=1−0.33=0.66
N
o
w
n1
(molesofethanol)
Hencemole
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2