This reaction is first order with respect to reactant a and second order with respect to reactant b. if the concnetration of a is doubled and the concnetration of b is halved, th erate of the reaction would .

The rate of the reaction would be halved.

Explanation:

The reaction is first order with respect to reactant A and second order with respect to reactant B. The rate equation is [A][B]^2

If the concentration of A is doubled and the concentration of B is halved, rate = 2 × (1/2)^2 = 2 × 1/4 = 1/2.

The rate would be halved.

the product of the pressure and volume is also constant