How does the rate of a chemical reaction change if the concentration of both reactants increases 4 times? 2NO + O2 → 2 NO2

The rate will increase 32 times if the concentration of both reactants increases 4 times

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

For the reaction :    

k= rate constant

order with respect to = 2

order with respect to = 1

Thus on increasing the concentration of reactants 4 times :

Thus rate will increase 32 times if the concentration of both reactants increases 4 times