# . 4.9    A reaction is first order in A and second order in B.          (ii) How is the rate affected on increasing the concentration of B three times?

If the concentration of [B] is increased by 3 times, then

$-\frac{d[R]}{dt}=k[A][3B]^{2}$

$=9k[A][B]^{2}$

Therefore, the rate of reaction will increase 9 times.

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