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Mole fraction of ethanol in ethanol wate...

Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is

A

`25%`

B

`75%`

C

`46%`

D

`54%`

Text Solution

Verified by Experts

The correct Answer is:
C
`X_(C_(2)H_(5)OH) = 25`
`X_(H_(2)O) = 75`
`n_(C_(2)H_(5)OH) = 25`
`w_(C_(2)H_(5)OH) = .25 xx 46 = 11.5g`
`n_(H_(2)O) = 75`
`%` wt of `C_(2)H_(5)OH`
`= (11.5)/(11.5 + 13.5) xx 100 = 45%` .
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