Mole fraction calculator
Compare one component with the combined amount of all other components.
Formula
x = n / (n + n_other); mole percent = 100x
Selected component: 1 mol · All other components combined: 3 mol · Mole fraction ≈ (1 mol)÷((1 mol)+(3 mol)) · Combined fraction of others ≈ (3 mol)÷((1 mol)+(3 mol)) · Mole percent ≈ (0.25)×100
How to use
- Enter the component’s amount in mol or mmol.
- Enter the combined amount of all other components.
- Read the dimensionless fraction and mole percent.
Examples
- 1 mol plus 3 mol of other components gives x = 0.25 and 25 mol%.
Frequently asked questions
What goes in the second field?
Sum every other component, including the solvent, in moles.
Can both amounts be zero?
No. The total amount must be positive.
Is mole fraction the same as mass fraction?
No. Mole fraction compares amounts in moles, not masses.
Sources
Updated: