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    Vicky1205's Avatar
    Vicky1205 Posts: 1, Reputation: 1
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    #1

    Apr 11, 2015, 10:58 AM
    Chemical kinetics
    The half life for radioactive decay (1st order) of plutonium 239 is 24,000 years. How many years would it take for 1 mole of this radioactive material to decay so that just one atom remains?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Apr 13, 2015, 05:44 PM
    Well, how many atoms in a mole? Avogadro's number. Start with that. PS You will be very old!
    kreysiz's Avatar
    kreysiz Posts: 37, Reputation: 2
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    #3

    Jul 19, 2015, 10:21 AM
    See, the governing equation for 1st order kinetics is :-
    k*t = ln{[A0]/[A]}; where k = rate constant = ln2/half life ; t = time interval in which the concentration of the reactant changes from [A0] to [A].

    Use the above eqaution to get your result.

    Revert with queries, if any.
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