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@wikipedia


Synonym
Mole fraction = Molar fraction


A ratio of 
amount of a given mixture component to the total amount of substance 

LaTeX Math Inline
body\nu
 in the mixture:

LaTeX Math Block
anchorx
alignmentleft
x_k = \frac{\nu_k}{\nu} = \frac{N_k}{N} 

where

LaTeX Math Inline
body \nu_i = N_i/N_A

amount of substance of the 

LaTeX Math Inline
bodyi
-th mixture component

LaTeX Math Inline
body\nu = \sum_i \nu_i

total amount of substance in the mixture 

LaTeX Math Inline
bodyN_A

Avogadro constant

LaTeX Math Inline
bodyN_i

amount of molecules/atoms in the 

LaTeX Math Inline
bodyi
-th mixture component

LaTeX Math Inline
bodyN = \sum_i N_i

total amount of molecules/atoms in the mixture 


As per definition the sum of all mole fractions is strictly unit: 

LaTeX Math Inline
body\sum_i x_i = 1
.

See Also


Natural Science / Chemistry / Chemical Substance / Mixture

Pure substance ]