Chemistry

Afirst order reaction completed the 90%in 30minute find the time for99.9%,,,,

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  1. ln(No/N) = kt
    You know No = 100
    N = 100-90 = 10
    K = ?
    t = 30
    Solve for k.

    Use the same equation above, plug in k from above, the new N and solve for the new t.

    Post your work if you get stuck.

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  2. https://socratic.org/questions/a-first-order-reaction-is-50-completed-after-30-minutes-this-implies-that-the-ti

    ln(.1)=-k (30)
    k== 0.0767528364

    ln(.1/100)= -0.0767528364 t
    t= ln(.001)/0.0767528364=90 min
    Now think: it took 30 min to go to 90 percent. In another 30 min, it will go 9 percent (to 99). In another 30 min, it will go another .9 percent (99.9)

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