The rate constant for the reaction of 2A --> B is 7.57X10^-3 at 100 degrees C. The reaction is first order in A. How long in seconds will it take for A to decrease from 1.95 M to 0.630 M?

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Q: How long, in seconds, would it take for the concentration of A to decrease from 0.920 M to 0.240 M?

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