Science
Molality
Convert solute mass to moles using molar mass, then divide by kilograms of solvent to obtain molality independently of solution volume.
Calculators / Science / Mole fraction of two components
Mole fraction of two components calculator
Divide each component’s amount in moles by the total amount to obtain two complementary mole fractions that sum to one.
On this page
Mole fraction A0.25
Mole fraction B0.75
Calculator controls
How to calculate
Divide each component’s amount in moles by the total amount to obtain two complementary mole fractions that sum to one.
Mole fraction A = a/(a+b); Mole fraction B = b/(a+b)
Worked example
Moles of component A: 1; Moles of component B: 3.
Mole fraction A: 0.25 ; Mole fraction B: 0.75 .
Assumptions and limits
Divide each component’s amount in moles by the total amount to obtain two complementary mole fractions that sum to one. Molality uses kilograms of solvent, not solution volume. Mole fractions assume exactly the two entered components and their actual amounts.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Divide each component’s amount in moles by the total amount to obtain two complementary mole fractions that sum to one.
When this tool is useful
Mole fraction A = a/(a+b); Mole fraction B = b/(a+b)
Understanding your inputs
| Input | What to enter |
|---|---|
| Moles of component A | Enter a number of at least 0 and no more than 1000000000000. |
| Moles of component B | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Divide each component’s amount in moles by the total amount to obtain two complementary mole fractions that sum to one. Molality uses kilograms of solvent, not solution volume. Mole fractions assume exactly the two entered components and their actual amounts.
How is the result calculated?
Mole fraction A = a/(a+b); Mole fraction B = b/(a+b)