Mole fraction

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In chemistry, the mole fraction or molar fraction, also called mole proportion or molar proportion, is a quantity defined as the ratio between the amount of a constituent substance, ni (expressed in unit of moles, symbol mol), and the total amount of all constituents in a mixture, ntot (also expressed in moles): x i = n i n t o t {\displaystyle x_{i}={\frac {n_{i}}{n_{\mathrm {tot} }}}} It is denoted xi (lowercase Roman letter x), sometimes χi (lowercase Greek letter chi). (For mixtures of gases, the letter y is recommended.) It is a dimensionless quantity with dimension of...

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