1. The rate constant for a certain reaction is k = 1.30×10−3 s−1s−1 . If the initial reactant concentration was 0.300 MM

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1. The rate constant for a certain reaction is k =
1.30×10−3 s−1s−1 . If the initial reactant
concentration was 0.300 MM, what will the concentration be
after 20.0 minutes?
2. A zero-order reaction has a constant rate of
3.60×10−4 M/sM/s. If after 80.0 seconds the
concentration has dropped to 5.50×10−2 MM, what was
the initial concentration?
Express your answer with the appropriate units.