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Define an expression for the rate consta...

Define an expression for the rate constant of a 1st order reaction. Define half life period. A first order reaction takes 69.3 minutes for 50% completion. How much time will be needed for 80% completion?

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What is half time period ? A first order reaction takes 69.3 minutes for 50 % completion. How much time will be needed for 80% completion.

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