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138 g of ethyl alcohol is mixed with 72 ...

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`

Text Solution

Verified by Experts

The correct Answer is:
A
Number of moles of ethyl alcohol `=(138)/(46)=3` ,brgt Number of moles of water `=(72)/(18)=4`
`X_(C_(2)H_(5)OH)=(3)/(3+4)`
`=(3)/(7)`
`X_(H_(2)O)=(4)/(3+4)`
`=(4)/(7)`
`(X_(C_(2)H_(5)OH))/(X_(H_(2)O))=(3//7)/(4//7)`
`=(3)/(4)`
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