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A zero order reaction has a constant rate of 2.8 10 4 molL 1 s 1 . If after 45 seconds the concentration has dropped

A zero order reaction has a constant rate of 2.8 10⁴ molL¹s¹. If after 45 seconds the concentration has dropped to 3.8 10² molL¹, what was the initial concentration (in molL¹)?

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