What is Rate of a reaction

What is the rate of a reaction?

What is meant by rate of a reaction ? Differentiate between average rate and instantaneous rate of a reaction.

Rate law for the reaction A + B to product is rate =K [A]^(2) [B]. What is the rate of reaction at a given temperature is 0.22Ms^(-1) , when [A]=1 M and [B]=0.25 M?

Consider the reaction, 2N_(2) O_(5) to 4NO_(2) + O_(2) In the reaction NO_(2) is being formed at the rate of 0.0125 mol L^(-1) s^(-1) . What is the rate of reaction at this time?

Consider the reaction, 2N_(2) O_(5) to 4NO_(2) + O_(2) In the reaction NO_(2) is being formed at the rate of 0.0125 mol L^(-1) s^(-1) . What is the rate of reaction at this time?