Dear Shailendra

Active mass was defined as "the amount of substance in the sphere of action" For species in solution active mass is equal to concentration. For solids active mass is taken as a constant. α, a and b were regarded as empirical constants, to be determined by experiment.

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active mass is the initial concentration

concept of active mass is used in equilibrium

some times also used in chemical kinetics

the mass of reactants that use in chemical reaction .its unit is mol/dm3.