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# Define the average rate of reaction?

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## The average rate of reaction:"It is defined as the ratio of change in concentration of reactants or products to the change in a time interval of a chemical reaction."Mathematically, the average rate of reaction is denoted by “r” and is represented as follows:$\text{Averagerateofreaction}=\frac{\text{Change in concentration}}{\text{Time}}\phantom{\rule{0ex}{0ex}}\mathrm{rate}\left(\mathrm{r}\right)=\frac{\text{Δx}}{\text{Δt}}$Sign of average rate of reaction:When the rate of concentration of reactant decreases then the average rate of reaction will be negative.When the rate of concentration of product increases then the average rate of reaction will be positive.

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