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a.) The rate constant for the reaction is 0.460 M–1·s–1 at 200 °C. A--> products. If...

a.) The rate constant for the reaction is 0.460 M–1·s–1 at 200 °C. A--> products. If the initial concentration of A is 0.00680 M. what is the concentration after 315 s?
b.)The rate constant for this zero-order reaction is 0.0190 M·s–1 at 300 °C. A--> products. How long (in seconds) would it take for the concentration of A to decrease from 0.800 M to 0.240 M?
c.)The rate constant for this second-order reaction is 0.520 M–1·s–1 at 300 °C. A--> products .How long (in seconds) would it take for the concentration of A to decrease from 0.630 M to 0.390 M?
d.)The rate constant for this first-order reaction is 0.970 s–1 at 400 °C. A--> products. How long (in seconds) would it take for the concentration of A to decrease from 0.840 M to 0.210 M?

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