Question

what is the order of the reaction if a decomposes to b and c with a rate constant of $8.43 \times 10^{-3}\text{s}^{-1}$ at a certain temperature?
answer:
a zero
b first
c second
d third
e cannot determine order from this information.

Explanation:

Step1: Recall rate constant units

Reaction order is linked to rate constant units.

Step2: Match given unit to order

The rate constant has units of $s^{-1}$, which corresponds to a first-order reaction.

Answer:

B. first