Question

in an aqueous solution mole fraction of water is 0.75.the molality of the solution is

Answer 1

take a look at ur answer

Answer 2

Answer:it is 18.5

Explanation:so the mole fraction of solvent is given 0.75

1-0.75=0.25 ( mole frac. of solute)

Now making 2 equations

0.25=nA/nA+nB.......1

0.75=nB/nB+nA........2 { let 1÷2}

:1/3=nA/nB

For molality.. No. of moles of solute/mass of solvent in kg

So no. of moles of solvent = given mass of solvent/mass of solvent

3×18= given mass of solvent

By putting in formula

1/3×18/1000

1000/54

18.5m