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A decomposition reaction has a rate constant of 0.0019 yr -1.
a) What is the half-life of the reaction?
______ yr

(b) How long does it take for [reactant] to reach 12.5% of its original value?
______ yr

  • Chemistry -

    k = 0.693/t1/2
    Substitute and solve for t1/2

    ln(No/N) = kt
    If you let No = 100, then N = 12.5; substitute k and solve for t in years.

  • Chemistry -


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