User:Milton Beychok/Sandbox: Difference between revisions
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The '''mole fraction''' is a measure of the concentration of a component substance in a mixture of substances. It is defined as the number of [[mole]]s of a component substance in a mixture divided by the total number of moles of the mixture. It may be expressed as: | The '''mole fraction''' is a measure of the concentration of a component substance in a mixture of substances. It is defined as the number of [[mole]]s of a component substance in a mixture divided by the total number of moles of the mixture.<ref>{{cite book|author=N.A. Gokcen and R.G. Reddy|title=Thermodynamics|edition=2nd Edition|publisher=Plenum Press|year=1996|id=ISBN 0-306-45380-0}}</ref> It may be expressed as: | ||
:<math>x_\mathrm{a} = \frac{n_\mathrm{a}}{n_\mathrm{a} + n_\mathrm{b} + n_\mathrm{c} \ldots} = \frac{n_\mathrm{a}}{n_\mathrm{total}}</math> | :<math>x_\mathrm{a} = \frac{n_\mathrm{a}}{n_\mathrm{a} + n_\mathrm{b} + n_\mathrm{c} \ldots} = \frac{n_\mathrm{a}}{n_\mathrm{total}}</math> | ||
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==Applications== | ==Applications== | ||
Mole fractions are very commonly used | Mole fractions are very commonly used in [[chemistry]], [[thermodynamics]], [[chemical engineering]] and other disciplines to express concentrations of specific substances in [[gas]] mixtures and [[liquid]] [[solutions]]. | ||
==References== | |||
{{reflist}} |
Revision as of 01:16, 3 September 2008
The mole fraction is a measure of the concentration of a component substance in a mixture of substances. It is defined as the number of moles of a component substance in a mixture divided by the total number of moles of the mixture.[1] It may be expressed as:
where: | |
= the mole fraction of component in the mixture | |
= the number of moles of component in the mixture | |
= the number of moles of component in the mixture | |
= the number of moles of component in the mixture | |
= the total number of moles in the mixture |
Mole fractions are dimensional numbers and they are often referred to as mol fractions.
Applications
Mole fractions are very commonly used in chemistry, thermodynamics, chemical engineering and other disciplines to express concentrations of specific substances in gas mixtures and liquid solutions.
References
- ↑ N.A. Gokcen and R.G. Reddy (1996). Thermodynamics, 2nd Edition. Plenum Press. ISBN 0-306-45380-0.