Chemistry

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Po-210 Ia an alpha emitter with a half-life of 138 days. how many grams of Po-210 remain after 552 days if the sample initially contained 5.80g of Po-210?

  • Chemistry -

    Suppose that you start with 1000000 atoms of a particular radioactive isotope. how many half-lives woruld be required to reduce the number of undecayed atoms to fewer than 1000?

  • Chemistry -

    #1.
    k = 0.693/t1/2
    Substitute k in the below equation.

    ln(No/N) = kt
    No = 5.80g
    N = ?
    K = from above
    t = 552 days
    Solve for N

    For #2, you want 1,000,000/2^n = 1,000
    Solve for n. The easy way to do that is to solve for 2^n and then n.

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