Mole Fraction Calculator
Calculate mole fractions of components in a mixture from moles of each.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Enter the number of moles for each component in the mixture. The calculator sums all moles and divides each component by the total to give the mole fraction. You can enter 2 or 3 components.
About the Mole Fraction Calculator
Mole fraction represents the proportion of a mixture that is made up of a particular component, measured in moles. It is dimensionless and always sums to 1 across all components. Mole fractions are commonly used in thermodynamic calculations involving gas mixtures and solution properties.
Frequently Asked Questions
What is a mole fraction?
A mole fraction is the ratio of moles of one component to the total moles of all components in a mixture. It is a dimensionless number between 0 and 1, and all mole fractions in a mixture sum to exactly 1.
How is mole fraction used in chemistry?
Mole fractions are used in vapor pressure calculations (Raoult's law), partial pressure calculations (Dalton's law), and colligative property equations. They provide a temperature-independent measure of composition.
Can mole fraction be greater than 1?
No. Since mole fraction is a ratio of part to whole, it is always between 0 and 1. The sum of all mole fractions in any mixture must equal exactly 1.