# Mole fraction

Mole fraction refers to the fraction of a component in a solution when the amounts (component and solution) are expressed in moles. In other words, Mole fraction of a component is the ratio of moles of that particular component to the total moles of the solution.

_{i}) can be calculated by

_{i}= Mole of i

^{th}component of the solution

n_{tot} = Mole of the solution

Suppose a solution contains 3 components (two solutes, A and B, and a solvent C)

_{A}) =

_{A}= Mole of component A

_{B}= Mole of component B

n_{C} = Mole of component C

_{tot}) of the solution will be equal to

n_{tot} = n_{A} + n_{B} + n_{C}

Therefore above equation can also be written

Since value of mole fraction is obtained by dividing mass of a component by total mass of solution, it dimensionless. However, sometimes it is written as mole/mole.

**The sum of all Mole fraction is equal to 1.**

𝒳_{A} + 𝒳_{B} + 𝒳_{C} = 1

**Independent of temperature**

In contrast to density, Mole fraction is independent of temperature i.e., if temperature changes, the value of Mole fraction does not change.