Mole fraction is a way to express the concentration of a solution. It is a dimensionless quantity used in Class 12 Chemistry (Solutions chapter).
Mole fraction is temperature-independent, unlike molarity which changes with temperature.
Mole fraction of solute is the ratio of the number of moles of solute to the total number of moles of all components in the solution.
ฯ(solute) = n(solute) / [n(solute) + n(solvent)]
Where:
If 2 moles of NaCl are dissolved in 8 moles of water:
In a very dilute solution, n(solute) << n(solvent), so mole fraction of solute approaches 0 and mole fraction of solvent approaches 1.
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