User:Milton Beychok/Sandbox

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 of a mixture divided by the total number of moles of the mixture. It may be expressed as:

$x_{\mathrm {a} }={\frac {n_{\mathrm {a} }}{n_{\mathrm {a} }+n_{\mathrm {b} }+n_{\mathrm {c} }\ldots }}={\frac {n_{\mathrm {a} }}{n_{\mathrm {total} }}}$