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Posted by on Thursday, June 20, 2013 at 9:38pm.

60.0 grams of Th-210 with a half life of 50,000 years is allowed to decay for 250,000 years. How much of the original quantity remains? In addition, Th-210 decays via beta emission. Write the equation for its transmutation.

  • Chemistry H - , Thursday, June 20, 2013 at 11:05pm

    The long way.
    k = 0.693/t1/2
    ln(No/N) = kt
    No = 60
    N = solve for N.
    k from above.
    t = 250,000

    First number is atomic number. Second number is mass number.
    90Th210 ==> -1e0 + 91Pa210

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