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The rate constant for a certain reaction is k = 2.00×10−3 s−1 . If the initial...

The rate constant for a certain reaction is k = 2.00×10−3 s−1 . If the initial reactant concentration was 0.400 M, what will the concentration be after 20.0 minutes? Express your answer with the appropriate units.

Part B A zero-order reaction has a constant rate of 4.70×10−4 M/s. If after 70.0 seconds the concentration has dropped to 2.00×10−2 M, what was the initial concentration?

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