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5. The half-life for substance A in a second order reaction of type A -> products, is 25 s at 20C when the initial concentration

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5. The half-life for substance A in a second order reaction of type A -> products, is 25 s at 20C when the initial concentration of A is 0.8 M. The rate of the reaction doubles as the temperature rises from 20 C to 30 C. Calculate a. the time needed to lower the concentration of A from 0.8 M to 0.25 M at 20C b. the activation energy of the reaction (10 pts)

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