basic

Mass Percent to Mole Fraction Calculator

x_solute from mass-% and the two molar masses.

Convert a binary solution's solute mass percent into the solute mole fraction, given the molar masses of the solute and the solvent: x = (w/M_s) / (w/M_s + (100−w)/M_w).

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_solute = (w/M_s) / (w/M_s + (100−w)/M_solv)

In depth

Convert a binary solution's solute mass percent into the solute mole fraction, given the molar masses of the solute and the solvent: x = (w/M_s) / (w/M_s + (100−w)/M_w).