The rate of forward reaction equal to the rate of reverse reaction hence  the amount of reactants will never reach zero.
A chemical reaction involves the combnation of two or more species to yiled products. We must know that a point is always reached in a reaction when the rate of forward reaction equal to the rate of reverse reaction hence  the amount of reactants will never reach zero.
Also, if the reaction starts with 0 molecules of reactants and 100 molecules of products, the amount of products will decrease overtime.
Learn more about rate of reaction: https://brainly.com/question/13929053