Explain the difference between instantaneous rate of a reaction and average rate of a reaction .

Explanation

Average rate of a reaction is the change in molar concentration of the species taking part in a reaction divided by the time taken for the change. Mathematically,
`r_(av) = (-Delta[R])/(Delta[t]) = (Delta[P])/(Delta[t])`
Instaneous rate of a reaction is the average rate at the smallest interval of time.
Mathematically,
`r_("inst")=(-d[R])/(dt)=(d[P])/(dt)`