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Mole Fraction Calculator

Chemistry
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Calculates the mole fraction of a substance in a mixture using two different methods: either by providing the number of moles of each substance or by providing the mass of each substance and their respective molar masses.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Calculation Method, Moles of Substance, Total Moles in Mixture, Mass of Substance, Molar Mass of Substance, Mass of Total Mixture, Molar Mass of Total Mixture, and Total Moles in Mixture (Calculated) in the units shown.

Step 2

Read Mole Fraction in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Simple Example (Moles)

Calculation Method: Using Moles; Moles of Substance: 2 mol; Total Moles in Mixture: 10 mol; Mass of Substance: 10 grams; Molar Mass of Substance: 18.015 g/mol; Mass of Total Mixture: 50 grams; Molar Mass of Total Mixture: 18.015 g/mol; Total Moles in Mixture (Calculated): 1 mol

Mole Fraction: 0.2

Water in Solution (Moles)

Calculation Method: Using Moles; Moles of Substance: 5 mol; Total Moles in Mixture: 55.5 mol; Mass of Substance: 10 grams; Molar Mass of Substance: 18.015 g/mol; Mass of Total Mixture: 50 grams; Molar Mass of Total Mixture: 18.015 g/mol; Total Moles in Mixture (Calculated): 1 mol

Mole Fraction: 0.09009009009

Ethanol in Water (Mass)

Calculation Method: Using Mass and Molar Mass; Moles of Substance: 1 mol; Total Moles in Mixture: 5 mol; Mass of Substance: 46.07 grams; Molar Mass of Substance: 46.07 g/mol; Mass of Total Mixture: 100 grams; Molar Mass of Total Mixture: 18.015 g/mol; Total Moles in Mixture (Calculated): 1 mol

Mole Fraction: 0.18015

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