Final answer:
The specific rate constant in a zero-order rate expression has units of moles per liter per second C. (M/t), as the rate is independent of reactant concentration.
Step-by-step explanation:
In a zero-order rate expression, the specific rate constant must possess units that allow the overall reaction rate to be expressed in terms of moles per liter per second C. (M/t). For a zero-order reaction, no concentration term appears in the rate law, thus the rate is constant and independent of the concentration of reactants. Thus, for the reaction rate to have units of M/s (moles per liter per second), the rate constant must also have units of M/t.