Mole fraction: Mole fraction of a constituent (solute as well as solvent) is the fraction obtained by dividing number of moles of that constituent by the total number of moles of all the constituents present in the solution. In a binary mixture, there are two components A and B and their moles are nA and nB respectively. If their mole fractions are xA and xB
If the mass of A and B are WA and WB respectively and their molar masses are MA and MB then,
nA = \(\frac { { W }_{ A } }{ { M }_{ A } } \)
nB = \(\frac { { W }_{ B } }{ { M }_{ B } } \)
The sum of mole fractions of all the components are always equal to 1.
XA + xB = 1