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Chemistry

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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 - ,

    k = 0.693/t1/2
    ln(No/N) = kt
    Use No = 100 (you can choose any number)
    N = 100 x 0.011 = ?
    k from above.
    t = solve for this.

  • Chemistry - ,

    DrBob222 explain better please

  • Chemistry - ,

    So what is it? or how to guide in filling in the date in the equation?

  • Chemistry - ,

    Thank you DrBob222,

    the fraction left after t seconds is (1/2)^(t/1234)

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

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