The gas phase reaction between NO and O2 is second order with respect to NO and first order with respect to 02, what would happen to the reaction rate if the concentrations of both reactants were halved with everything else held constant?
a. It would decrease by a factor of 8 It would remain unchanged.
b. It would decrease by a factor of 16.
c. It would decrease by a factor of 4.
d. It would decrease by a factor of 2

It would decrease by a factor of 8

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.

   (1)

When the concentration of both reactants were halved:

 (2)

Dividing (2) by (1)

Thus it would decrease by a factor of 8

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