The mole fraction of water in `20% (wt.//wt.)` aqueous solution of `H_(2)O_(2)` is:

Options

A. `( 77)/( 68)`
B. `(68)/( 77)`
C. `(20)/(80)`
D. `(80)/(20)`

Answer

B

Explanation

20% of `H_(2)O_(2)` solution contains 80% water.
Number of moles of water `= ( 80)/( 18) =A `
Number of moles of `H_(2)O_(2) =( 20)/( 34) =B `
Mole fraction of water = `( A)/( A+ B)`