molality

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molality:

see concentrationconcentration,
in chemistry, measure of the relative proportions of two or more quantities in a mixture. The concentration of a solute is very important in studying chemical reactions because it determines how often molecules collide in solution and thus indirectly determines
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molality

[mō′lal·əd·ē]
(chemistry)
Concentration given as moles per 1000 grams of solvent.