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Commonly used mass fraction units in chemistry include weight percent ( w/w), volume percent ( v/v), and mole fraction (X).

Weight percent ( w/w) is calculated by dividing the mass of the solute by the total mass of the solution and multiplying by 100.

Volume percent ( v/v) is calculated by dividing the volume of the solute by the total volume of the solution and multiplying by 100.

Mole fraction (X) is calculated by dividing the moles of the solute by the total moles of the solution.

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