Mass Fraction and Concentration

The mass fraction of a component in a mixture is defined as the ratio of mass of the component gas to the total mass as 

Mass concentration or mass density is defined as the mass of the species i per unit volume of the mixture and expressed as 

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Since effects of radioactive decay on the molar mass can be neglected, q>bas Sr can be replaced with an excellent precision by expressed through equation (1.3.2) as a function of mass fractions / and concentrations CSr requires... 

Mole fraction, mass fraction, and concentration can be used as composition variables for both solvent and solute, just as they are for mixtures in general. A fourth composition variable, molality, is often used for a solute. The molality of solute species B is defined by... 

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