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The effective rate constant for a gaseous reaction that has a Lindemann-Hinshelwood mechanism is 2.5×10-4 s-1...

The effective rate constant for a gaseous reaction that has a Lindemann-Hinshelwood mechanism is 2.5×10-4 s-1 at 1.3 kPa and 2.1×10-5 s-1 at 12 Pa. Calculate the rate constant for the activation step in the mechanism.

Enter your answer with 3 significant numbers, in the unit of Pa-1s-1

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