Question

mole fraction of benzene in a solution in toluene is 0.40. calculate the weight % of benzene in solution

Answer 1

Explanation:

Let the mole fraction of benzene be X1 and toulene be X2

We know that in a solution X1+X2=1

As X1=0.1 and mole fraction of toulene will be 0.4

1 mole of benzene C6H6 = 78gm

so 0.4 mole of benzene = 78×0.4=31.2

0.4 mole of toulene C6H5CH3=92×0.4=36.8

Weight % = Mass of component/total mass of the solution x100

Weight % of benzene = 31.2/31.2+36.8*100

=31.2/68*100=45.88 persent