basic

Mole Fraction from Mass Percent Calculator

Mole fraction X_A from mass % and the two molar masses.

Compute the mole fraction of solute A in a binary mixture from its mass percentage and the molar masses of solute and solvent: X_A = (w_A / M_A) / (w_A / M_A + (100 − w_A) / M_B).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

%
g/mol
g/mol

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

X_A = (w_A / M_A) / (w_A / M_A + w_B / M_B), w_B = 100 − w_A.

In depth

Compute the mole fraction of solute A in a binary mixture from its mass percentage and the molar masses of solute and solvent: X_A = (w_A / M_A) / (w_A / M_A + (100 − w_A) / M_B).