Question

The rate constant of a reaction is \(k = 3.28\times 10^{-4}\) s\(^{-1}\). Find the order of the reaction.

• A. Zero order
• B. First order
• C. Second order
• D. Third order

Hint:

A rate constant with units of s^-1 means first order.

Answer 1

The Correct Option is B

Step 1: Idea:
Match the unit of $k$ with the order.

Step 2: Result:
Only a first order rate law $r = k[A]$ gives $k = r/[A]$ with units of $\text{mol L}^{-1}\text{s}^{-1} / \text{mol L}^{-1} = \text{s}^{-1}$.

Final Answer:
The reaction is of first order, option (B). \[ \boxed{\text{First order}} \]