Mole Fraction Calculator

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Moles mode: type n directly. Mass mode: the calculator divides mass by molar mass for you. Gas mode: uses Dalton's law (X = P_i / P_total).
Add a third component to the mixture.
Amount of the first substance in moles (n = mass / molar mass).
mol
Amount of the second substance in moles.
mol
Turn on to estimate the partial vapour pressure of component A above the solution using Raoult's law: P_A = chi_A * P*_A.
Mole fraction of A (chi_A)
0.4
Mole fraction of B (chi_B)0.6
A as mole percent40%
B as mole percent60%
Total moles5mol

chi_A = 0.4, chi_B = 0.6 (sum = 1).

  • Component B dominates this solution, making up 60% of all molecules present.
  • Mole fractions are dimensionless and independent of temperature, unlike molarity which changes with volume.
  • Multiply any component's mole fraction by the total pressure to find its partial pressure (Dalton's law for gas mixtures).

Next stepSwitch to mass mode above to skip the moles conversion step, or enable Raoult's law to see the vapour pressure above the solution.

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