What is the active mass of $5 g$ $CaO$ ?

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Solution

Active mass
The number of g mol per liter is known as active mass.
It is the mass that is taking part in a reaction.
It's also known as molarity or molar concentration.
It is the effective concentration of a material.
Active mass of $5 g$ $CaO$ :
In the case of solid the mass is always constant.
So, it is taken as unity.
As $CaO$ is a solid Hence its active mass will be one.
The calculated active mass of $CaO$ is $1 g$ because, in the case of solids, it is equal to $1$ .

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