A 3.5 molal aqueous solution of methyl alchol `(CH_(3)OH)` is supplied. What is the mole fraction of methyle alcohol in the solution ?

Options

A. `0.086`
B. `0.050`
C. `0.100`
D. `0.190`

Answer

A

Explanation

5.2 molal solution means that 5.2 moles of solute `(CH_(3)OH)` are present in 1000 g of water .
Moles of water `n_("water") = (1000)/(18) = 55.56`
`x_(CH_(3)OH) = (5.2)/(5.2 +55.56) = 0.086`