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August 30, 2015

Homework Help: Chemistry

Posted by biggie on Saturday, April 10, 2010 at 12:43pm.

In a first order decomposition reaction, 50% of a compound decomposes in 10.5 min. What is the rate constant of the reaction? How long does it take for 75% of the compound to decompose?

My professor did this problem in class:

k = .693 / 10.5 mins
= .066 min ^-1

where did .693 come from?

Thanks

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