Homework Help: chemistry

Posted by NIK on Thursday, November 29, 2012 at 10:23am.

N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long will it take, in seconds, for the concentration of N2O5 to fall to 1.1% of its initial value?

chemistry - Steve, Thursday, November 29, 2012 at 11:51am
the fraction left after t seconds is (1/2)^(t/1234)

so, solve

(1/2)^(t/1234) = 0.011
t = 8028.84

makes sense: .011 is around 1/64, or 6 half-lives
chemistry - amar chauhan, Thursday, November 29, 2012 at 3:35pm
t=8028.84
chemistry - mike, Monday, December 10, 2012 at 4:15pm
8028.84

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