Question

For the reaction $A+B\to C$, determine the order of the reaction with respect to $B$ from the information given below:

Initial [A]	Initial [B]	Initial rate of formation of $C$
1.00	1.00	2.0
1.00	2.00	8.0
2.00	2.00	16.0

• A. zero order
• B. first order
• C. second order
• D. third order

Answer 1

Answer: (C)

second order

Since, on keeping $\left[A\right]$ constant, doubling $\left[B\right]$ increased the rate of formation of $\left[C\right]$ by 4 times.

$\therefore$ Order w.r.t B is 2.

Rate $\propto [B{]}^2$

A+B $\to$ C is a second-order reaction w.r.t B.