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A certain first-order reaction (A -->product) has a rate constant of 8.70×10^-3 s^-1 at 45 Celsius . How many minutes does it take for the concentration of the reactant,[A], to drop to 6.25% of the original concentration?

A certain second-order reaction (B--> products) has a rate constant of 1.40×10^-3 M^-1*s^-1 at 27 Celsius and an initial half-life of 280s . What is the concentration of the reactant B after one half-life?

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