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Multiple Choice
For the reaction 3A → B + 2C, the rate constant, k, was determined to be 4.3 × 10⁻³ M·s⁻¹. What is the order of the reaction?
A
Zero order
B
First order
C
Second order
D
Third order
Verified step by step guidance
1
Understand the relationship between the rate constant and the order of the reaction. The units of the rate constant can help determine the order of the reaction.
Recall that for a zero-order reaction, the rate constant k has units of concentration/time, typically M/s.
For a first-order reaction, the rate constant k has units of 1/time, typically s⁻¹.
For a second-order reaction, the rate constant k has units of 1/(concentration·time), typically M⁻¹·s⁻¹.
Examine the given units of the rate constant, 4.3 × 10⁻³ M·s⁻¹, and compare them to the typical units for each reaction order to determine the correct order.