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A 5.2 molal aqueous of methyl alcohol, C...

A `5.2` molal aqueous of methyl alcohol, `CH_(3)OH`, is supplied. What is the molefraction of methyl alcohol in the solution ?

A

`0.190`

B

`0.080`

C

`0.050`

D

`0.100`

Text Solution

Verified by Experts

The correct Answer is:
D
Moles of `CH_(3)OH = 5.2`
Mass of `CH_(3)OH=5.2xx32=166.4g`
Mass of water `=1000-166.4=833.6`
Moles of water `= (833.6)/(18)=46.3`
Mole fraction of `CH_(3)OH=(5.2)/(46.3+5.2)`
`=(5.2)/(51.5)=0.1`.
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