Mole fraction = moles of a component รท total moles of all components
For component A: (X_A = frac{n_A}{n_A + n_B + n_C + dots})
Find the number of moles of each substance
Add all moles to get total moles
Divide the moles of the chosen component by the total moles
The sum of all mole fractions in a mixture equals 1
Unitless quantity