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chemistry

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A reaction is first order and it takes 324 minutes for the reaction to be 50.0% complete. How long will it take for the reaction to be 85.0% complete at the same temperature? The answer is 887 minutes but I have no idea how he got that? help

  • chemistry -

    ln(No/N) = kt
    For convenience, start with 100 for No.
    ln(100/50) = k(324)
    solve for k, the rate constant.

    Second part.
    ln(100/15) = k(from above)t
    Solve for t.
    I get 886.8 which rounds to 887 minutes.

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