The rate constant for a certain reaction is k = 4.80×10⁻³ s−1.vIf the initial reactant concentration was 0.800 MM, what will the concentration be after 3.00 minutes?

Express your answer with the appropriate units.

B)

A zero-order reaction has a constant rate of 5.00×10⁻⁴ M/s. If after 50.0 seconds the concentration has dropped to 8.50×10⁻² M, what was the initial concentration?

Express your answer with the appropriate units.