The values of (mass and molar) concentration different in space triggers the phenomenon of diffusion. Ρ i = ρ i ( T 0 ) 1 + α Δ T Spatial variation and gradient Let us analyze how in the section followed: Benzene is used to dissolve the substance ( the unknown one whose molar mass has to be estimated) and it is made to 1.55 ( mass that of unknown mixture to Benzene). On small intervals of temperature the dependence is : By using the colligative properties method we can calculate molar mass without getting mass into picture. ![]() Mass concentration depends on the variation of the volume of the solution due mainly to thermal expansion. The notation common with mass density underlines the connection between the two quantities (the mass concentration being the mass density of a component in the solution), but it can be a source of confusion especially when they appear in the same formula undifferentiated by an additional symbol (like a star superscript, a bolded symbol or varrho). Sometimes the mass concentration is called titre. One litre of a solution usually contains either slightly more or slightly less than 1 litre of solvent because the process of dissolution causes volume of liquid to increase or decrease. The volume V in the definition refers to the volume of the solution, not the volume of the solvent.
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