Chemistry

Mole Fraction Calculator

Enter the moles of each component to get mole fractions.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Mole fraction of A
Mole fraction of A
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Mole fraction of B
—
Mole fraction of C
—
Mole fraction of D
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Total moles
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Mole Fraction Calculator by TheCalcTools

How the Mole Fraction Calculator works

The mole fraction of a component is its moles divided by the total moles in the mixture. The fractions always add up to 1; multiply by 100 for mole percent.

Mole fractions are used in Raoult’s law (vapour pressure) and Dalton’s law (partial pressures of gases).

The formula

x_i = n_i ÷ Σ n

Worked example

Using the default values shown in the calculator:

Moles of A2
Moles of B3
Moles of C (optional)0
Moles of D (optional)0
  1. Total = 2 + 3 = 5 mol. x_A = 2 ÷ 5 = 0.40; x_B = 0.60.

Result:

Mole fraction of A0.4000
Mole fraction of B0.6000
Mole fraction of C0.0000
Mole fraction of D0.0000
Total moles5.0000

Frequently asked questions

How do I get moles from grams?

Divide each mass by its molar mass first (see the grams to moles calculator).

Sources and further reading

Molality CalculatorEnter solute mass, molar mass and solvent mass to get the molality Grams to Moles Calculator (and Moles to Grams)Enter a formula and a mass or amount to convert between grams and moles Ideal Gas Law CalculatorChoose the unknown and enter the other three gas properties Normality CalculatorConvert molarity to normality, or find normality from mass and volume Boiling Point Elevation CalculatorEnter molality, the van 't Hoff factor and the solvent to get the boiling point… Freezing Point Depression CalculatorEnter molality, the van 't Hoff factor and the solvent to get the freezing point…

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.