The mole fraction of the solute in one molal aqueous solution is:

Options

A. `0.027`
B. `0.036`
C. `0.018`
D. `0.009`

Answer

C

Explanation

Molality of solution = mole of solute per kg of solvent
So, 1m = mole of solute per 1000 gof solvent Hence,
moles of solute in 1m aqueous solution = 1
moles of solvent 1 m aqueous solution
`=(1000)/(18)=55.55`
Mole fraction of solution in 1 m solution
`=(1)/(1+55.55)=(1)/(56.55)`
`=0.0176~~0.018`