A reaction is first order in A and second order in B.
i) Write the differential rate equation
ii) How is the rate affected on increasing the concentrations of B there times ?
iii) How is the rate effected when the concentrations of both A and B are doubled ?

Explanation

i) Rate `=k [A] [B]^(2)`
ii) Rate `=k[A] [3B]^(2)=9k [A] [B]^(2)` Rate of reaction becomes 9 times
iii) Rate `= k[2A] [2B]^(2)=8k [A] [B]^(2)` Rate of reaction becomes 8 times