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Half-life

lifeisogood
in Homework Help

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The half-life for a certain first order reaction is 13 minutes. If the initial concentration is 0.085M, how many minutes will it take for it to decrease to 0.055M

Use the fact that after 13 minutes the mass is now .0425. Put that into the y=Cert equation with C as the initial amount and y as the final amount (half the origional). Solve for r. Then go back and use your new value for r to solve.

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