# Mole Fraction

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Mole fraction is the number of molecules of a given component in a mixture divided by the total number of moles in the mixture.

Source: Boundless. “Mole Fraction and Mole Percent.” Boundless Chemistry. Boundless, 21 Jul. 2015. Retrieved 10 Apr. 2016 from https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/solutions-12/concentration-units-93/mole-fraction-and-mole-percent-402-1960/

Mole fraction is the number of molecules of a given component in a mixture divided by the total number of moles in the mixture.

Source: Boundless. “Mole Fraction and Mole Percent.” Boundless Chemistry. Boundless, 21 Jul. 2015. Retrieved 10 Apr. 2016 from https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/solutions-12/concentration-units-93/mole-fraction-and-mole-percent-402-1960/

Mole fraction, abbreviated as $$\chi_A$$ (Greek symbol chi), a dimensionless number, is the number of molecules (moles) of a solution in a mixture divided by the total number of moles present in the solution.  Mole fraction is a number between 0 and 1.000 and expressed as a percentage.

## Mole Fraction formula

 $$\large{ \chi_s = \frac{ n_i }{ n_t } }$$ $$\large{ \chi_s = \frac{ n_A}{ n_A \;+\; n_B \;+\; n_C \ldots} }$$

### Where:

 Units English Metric $$\large{ \chi_s }$$ (Greek symbol chi) = mole fraction $$\large{dimensionless}$$ $$\large{ n_i }$$ = amount of a constituent in moles $$\large{dimensionless}$$ $$\large{ n_t }$$ = total amount of all constituent in a mixture of moles $$\large{dimensionless}$$ $$\large{ n_A }$$ = number of moles in a solution $$\large{dimensionless}$$ $$\large{ n_A\; +\; n_B\; +\; n_C \ldots }$$ = total number of moles present in the solution $$\large{dimensionless}$$ Tags: Liquid Equations