a. How does the rate of production of X2 (average and instantaneous rates) compare to the rate of disappearance of X?
We know , the rate of a chemical reaction is i.e. the velocity of a reaction is actually the amount of chemical change occurring per unit time.
It is generally expressed by the decrease in amount of reactant or the increase in amount of product.
The average rate of a reaction is defined as the rate of change of amount of any reactant or product per unit time.
It is calculated by dividing the total change in amount of any one of the reactant or product by the time taken to do so.