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As we learnt in
Mole Fraction -
It is the ratio of moles of solute or moles of solvent to moles of the solution.
- wherein
If a substance ‘A’ dissolves in substance ‘B’ and their number of moles are
and 
respectively; then the mole fractions of A and B are given as
Mole fraction of A = (number of moles of A)/(number of moles of solution ) =
/(
+ 
)
At
,
Moles of N2 = 0.25
Moles of H2 = 0.75
Moles of NH3 = 1.5
Mole fraction of
Mole fraction of
Mole fraction of