`0.1` mole of NaCl is dissolved in 100g of water. The mole fraction of NaCl is

Options

A. `0.0213`
B. `0.0177`
C. `0.2290`
D. `0.0330`

Answer

B

Explanation

Molc fraction of NaCl
`= ("Number of mole of NaCl")/("Total number of mole of solution ")`
100 g water `- (100)/(18) ` mol water = 5.5 mol
Mole fraction of `NaCl = (0.1)/(0.1+5.5) =(0.1)/(5.6) = 0.178`