If a reaction is first order overall which of the following would be possible units for the rate constant?Question 4Select one:s–1.(mol/L) s–1. (mol/L)–1 s–1.(mol/L)–2 s–1.(mol/L) s.
Question
If a reaction is first order overall which of the following would be possible units for the rate constant?Question 4Select one:s–1.(mol/L) s–1. (mol/L)–1 s–1.(mol/L)–2 s–1.(mol/L) s.
Solution
The rate constant for a first order reaction has the units of s^-1 (per second). This is because the rate of a first order reaction is directly proportional to the concentration of one reactant. The units of rate are usually mol/(L*s), and the units of concentration are mol/L. Therefore, to get the units of rate when multiplied by concentration, the units of the rate constant must be 1/s or s^-1. So, the correct answer is s^-1.
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