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Kinetics: Concentration of a First Order Reaction

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The 1st order composition of hydrogen peroxide has a rate constant of 7.30 X 10-4 s^-1 at 25 degrees C. Determine the percent of hydrogen peroxide that has decomposed after the first 500 seconds?

Since I do not have the initial concentration, I was going to use the half life equation and take the percentage of that. The missing concentration has me stumped.

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This solution explains how to calculate the percentage of hydrogen peroxide remaining after 500 seconds if the decomposition follows a first-order rate law.

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