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Find mole fraction of ethanol and water ...

Find mole fraction of ethanol and water in a sample of rectified spirit which contain 95 % ethanol by mass.

Text Solution

Verified by Experts

Moles of Water (A) = `("Given Mass")/("Molar Mass")`
`=5/18`
= 0.2777
Moles of Ethanol (B) `=(95)/46`
= 2
Now, Mole fraction of A is
`x_A=(0.277)/(2.2777)=0.12`
Similarly, `x_b= (2)/(2.2777) = 0.88`
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