What are the units of the rate constant k for a second order reaction?Question 47 Answer Choices A. 1/s B. 1/s2 C. L/(mol•s) D. L/(mol•s2)
Question
What are the units of the rate constant k for a second order reaction?
Question 47
Answer Choices
A. 1/s
B. 1/s²
C. L/(mol•s)
D. L/(mol•s²)
Solution
The units of the rate constant k for a second order reaction are L/(mol•s). So, the correct answer is C. L/(mol•s).
Here's why:
The rate law for a second order reaction is Rate = k[A]^2.
The units of rate are always concentration/time, which in this case is mol/L•s.
The units of concentration [A] are mol/L.
Since the reaction is second order, we square the concentration units to get (mol/L)^2.
To make the units on both sides of the equation equal, the units of the rate constant k must be 1/(concentration•time), which simplifies to L/(mol•s).
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