138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is
138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is
A. `3:4`
B. `1:2`
C. `1:4`
D. `1:1`
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Correct Answer - A
`"Number of moles of "C_(2)H_(5)OH=(138)/(46)=3`
`"Number of moles of "H_(2)O=(72)/(18)=4`
`"Mole fraction, "x_(c_(2)H_(5)OH)=(3)/(7)`
`x_(H_(2)O)=(4)/(7)`
`(x_(C_(2)H_(5)OH))/(x_(H_(2)O))=(3//7)/(4//7)=(3)/(4)`
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