What is called the mass fraction of a solute?

The mass fraction of a solute is the ratio of the mass of a solute to the mass of a solution.
ω (in-va) = (m (in-va) / m (solution)) * 100% or ω (in-va) = m (in-va) / m (solution),
where ω (in-va) is the volume fraction of gas in the mixture,
m (in-va) – the mass of the solute,
m (solution) is the mass of the solution.

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