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Mole Fraction Calculator


The mole fraction calculator calculates the mole fraction, moles of solute, and moles of a solvent of multiple substances dissolving in the same solution. Our calculator makes your calculations fast and gives accurate results in moments.

What Is Mole Fraction?

It is the number of moles of a solute divided by the total amount of moles of the solution.


Our calculator makes your calculations fast and accessible by using the following formula:

$$ Mole fraction = \frac{no of moles of solute}{moles of solute + moles of solvent} $$

$$ Mole fraction = \frac{no of moles of solute}{no of moles of solution} $$

How To Calculate Mole Fraction?

Calculating mole fraction becomes easy if you go through the following example below:


Suppose you have 1.33 moles of hydrogen and 0.6 oxygen atoms in a water molecule. In that case, you need to calculate the mole fraction to mass fraction of each reactant (hydrogen and oxygen). How would you do that without using the mole fraction calculator?


Moles of hydrogen = 1.33 

Moles of oxygen = 0.6

We already know the formula, so we put the values in the formula for the next procedure:

$$ Mole fraction = \frac{no of moles of solute}{no of moles of solution} $$

$$ \frac{1.33mol}{1.93mol} = 0.68 $$

$$ \frac{0.6mol}{1.93mol} = 0.31 $$

So, 0.68 is the molar fraction of hydrogen, and 0.31 is the molar fraction of oxygen in a water molecule.

(Whereas 1.93 is the total number of moles of the reactants:1.33mol+0.6mol= 1.93mol)

Working of Mole Fraction Calculator:

Using this calculator is quite straightforward as it gives instant results by providing a couple of inputs as follows:


  • Put the moles of the solute and the solvent 
  • Put the total no. of moles of the solution 
  • Press the “Calculate” button.


  • The mole fraction calculator will give calculate mole fraction and display steps involved 


What Is Mole?

In Chemistry:

“A mole is the standard international unit that is used to calculate the number of atoms, molecules, or compounds present in the mixture as a result of a chemical reaction.”

$$ Mole = \frac{mass}{molecular weight} $$

The value of the mole is 6.02214076×10^23

What Are The Components of The Solution?

A solution distributes in two components that are as below:

  • Solute: A minor part of the solution that dissolved in the solvent.
  • Solvent: The greater part of the solution that dissolves the solute.

Example: Sugar dissolves in the water. Here you need to know sugar is a solute and water is a solvent.

What Is The Difference Between Mole Fraction And Mass Fraction?

The difference between the mole fraction and mass fraction is in the further section:

  • Mole fractions are the moles of the different components of different compounds.
  • Mass fraction deals with the masses of different components of different compounds.

Mole fraction can be converted into the mass fraction of the same compound and vice versa.

How To Convert Weight Percent To Mole Fraction?

The conversion of the weight percent to the mole fraction is given below as points that help in better understanding.

  • Divide the weight percentages by the molar weight
  • Sum the answers that are obtained
  • The molar percentage equals the answer obtained under step 1 divided by the step 2 answer and multiplied by 100

How To Convert Volume Fraction To Mole Fraction?

The mole fraction is the same as the volume fraction. When measured at the same temperature and pressure, the molar volume is the same as the volume fraction for all gases.

Why Is The Sum of All Mole Fractions Equal To 1?

The sum of all mole fractions is equal to the unity because the sum of the number of the moles of the component in the solution should always be greater than the individuals' number of moles. Basically, the mole fraction describes how concentrated a solution is.


From the source Wikipedia: Mole fraction, Properties, Related quantities.