Question

What is mole fraction?

Answer 1

Mole fraction of any component is the number of moles of that component by total number of moles of the solution. It is generally expressed as x₁= n₁/ (n₁+n₂)

where

x₁= mole fraction of component 1

n₁ = number of moles of component 1

n₂ = number of moles of component 2

For e.g.

Mass of solute=3g

Molar mass of solute=60g/mol

Number of moles of solute=3/60=0.05moles

Mass of water=250g

Molar mass of water=18g/mol

Number of moles of water=250/18=13.89moles

Total moles=0.05+13.89=13.94moles

Mole fraction of solute=0.05/13.94=0.00359