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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

`0.100`

B

`0.190`

C

`0.086`

D

`0.050`

Text Solution

Verified by Experts

The correct Answer is:
C
Mole fraction of solute `= (n)/(N+n)`
`n =` number of moles of solute
`N =` number of moles of solvent
where solute is methyl alcohol, solvent is water.
Given `n = 5.2 N = (100)/(18) = 55.55`
`:. "Mole fraction" = (5.2)/(5.2 + 55.55) = 0.086`
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