Question

Define the average rate of reaction?

Answer 1

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:

$$\begin{gathered} \text{Average rate of reaction}=\frac{\text{Change in concentration}}{\text{Time}} \\ \mathrm{rate}\left(\mathrm{r}\right)=\frac{\text{Δx}}{\text{Δt}} \end{gathered}$$

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.