In a series of experiments on the decomposition of dinitrogen pentoxide, N2O5 , rate constants were determined at two different temperatures. At 35°C, the rate constant was  1.4X10^-4/s; at 45°C, the rate constant was 5.0X10^-4 /s. a. What is the activation energy for this reaction? (Enter your answer to two significant figures.) Activation energy = J/mol b. What is the value of the rate constant at 85°C? (Enter your answer to two significant figures.)

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