Homework Help: half-life

Posted by Issac on Wednesday, February 7, 2007 at 5:43pm.

1. The half-life of a first-order reaction is 9.89 minutes. How many minutes will have elapsed after 27 half-lives?

My answer is 267.03.

2. The half-life of a second-order reaction is 2.508 days. How many days will have elapsed after 8 half-lives?

My answer is 5.330.

Is this correct or did I do it wrong?

PLEASE HELP ME!!!!

The first one is ok except you have only three signifant figures so you should report to 267.
I don't get your answer for #2. For a second order reaction, The first half life occurs at 2.508 days. The second half life is 2x that or 5.016 days, the third half life is 4x that or 10.032 days etc.

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