Question

What is the rate of a reaction ?​

Answer 1

The reaction rate or rate of reaction is the speed at which reactants are converted into products. For example, the oxidative rusting of iron under Earth's atmosphere is a slow reaction that can take many years, but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second.

Answer 2

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Rate of reaction :

the rate of reaction can be defined as the change in concentration of reactant or a product in unit time.

unit of rate: concentration/time or mol/lsec

or atm/sec.