| Mole Fraction |
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| CATEGORIES ABOUT MOLE FRACTION | |
| physical chemistry | |
| thermodynamics | |
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: where : The sum is over all components, including solvent in the case of a solution. As indicated above, the same Ratio is obtained using the number of Molecule s of , , and the total number of molecules of all kinds, . : where is Avogadro's Number ≈ 6.022 x 1023. By definition, the sum of the mole fractions equals one, a Normalization property. : Mole fractions are one way of representing the Concentration s of the various chemical species. They are an ideal-mixture approximation, and in practice, all measures of concentration must be multiplied by correction factors called Activity Coefficient s in order to yield accurate results. They are sometimes denoted by the lower case Greek letter (''chi'') instead of a Roman . All of the preceding numbers are Dimensionless . Other ways of representing concentrations, e.g., Molarity And Molality , yield Dimension al Quantities (per Litre , per Kilogram , etc.). When Chemical formulas seem to be taking the Logarithm s of dimensional quantities, there is an implied ratio, and such Expressions can always be rearranged so that the Argument s of the logarithms are dimensionless numbers, as they must be. For mixtures of molecules of differing sizes, see: Volume Fraction . SEE ALSO |
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