Question

if x molal of a compoumd in benzene has mole fraction of solute equal to .4 then the value of x is

Answer 1

Molality = Moles of solute / Weight of Solvent in kg
x = n / 1000
n = 10000x

Mole fraction of solute given is 0.4
0.4 = 1000x / (1000x + 1000/78)
0.4 = 1000x / (1000x + 12.82)
5.128 + 400x = 1000x
x = 117.0 m

Value of x is 117.0 m


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Answer 2

Answer:

correct answeris 3.2

Explanation:

X molal means X moles in 1kg benzene. Mole fraction of solute

=X+781000X=0.2

X+12.82X=0.2

X=0.2X+(12.82×0.2)=3.2