Mass fraction (chemistry)

Fraction of one substance's mass to the mass of the total mixture

In chemistry, the mass fraction of a substance within a mixture is the ratio w i {\displaystyle w_{i}} (alternatively denoted Y i {\displaystyle Y_{i}}) of the mass m i {\displaystyle m_{i}} of that substance to the total mass m tot {\displaystyle m_{\text{tot}}} of the mixture. Expressed as a formula, the mass fraction is: w i = m i m tot . {\displaystyle w_{i}={\frac {m_{i}}{m_{\text{tot}}}}.} Because the individual masses of the ingredients of a mixture sum to m tot {\displaystyle m_{\text{tot}}} , their mass fractions sum to unity: ∑ i = 1 n w i = 1.

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