Why is the active mass of solids taken as unity?

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Dr.azwar
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Homework Statement


I understood the fact that since the density of solids and liquids remain constant in a reaction therefore the active mass must be a constant.But why is it that we take it as unity. Is is some kind of coonverntion,or is there a reason behind it?

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The Attempt at a Solution

 
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Convention, with a good reason behind - 1 is a nice number that makes calculations easy.