Answer :
Imagine the reaction in model 1 starts with zero molecules of a and 100 molecules of b is the concentration of b decreases .
The model 1 starts with zero molecules of a and 100 molecules of b. if we start with the zero molecules of a the concentration of b will decreases as it will turn to the reactant. The chemical reaction occurs when the two or substance reactant to form a new product. so the reaction is given as :
A ⇄ B
so, if in the reaction it start with the molecules of a and the b is 100 molecules than the concentration of b decreases as the b turns in to the reactant.
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