Question

Active mass of 10 gm of CaCO3?

Answer 1

the active mass of CaCO3 is 1therefore active mass of solids are taken as 1, 
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Answer 2

The active mass of ten weight units of CaCo₃ is assumed to be one.

• This is because of the subsequent reason:
• "The active mass of chemical species is the concentration of a reacting substance." It is expressed typically in mol/liter.
• It can be expressed and understood from the following equation:

     => Active mass or Molar concentration = $\frac{Number of moles}{Volume}$

     => Number of moles = $\frac{Given mass}{Molecular mass}$

     => But Molar concentration ∝ Density of solids

• There is no amendment in activity with the amendment in amount or volume of the vessel throughout the time the reaction proceeds.
• Therefore the density of solid continually remains unchanged or constant since it is the ratio.
• As the density of pure solids and liquids is throughout the reaction constant, the molecular mass is additionally constant.
• Therefore the active mass of ten weight units or 10 gm of CaCo₃ which is a solid compound is taken as unity.