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PLS HELP HURRYYYYY!!!!!!!


The half-life of a radioactive kind of protactinium is 27 days. How much will be left after 54
days, if you start with 488 grams of it?

Respuesta :

Answer:

122 gm

Explanation:

54 days is 2 half lives :    ( 27 * 2 = 54)

  1/2   * 1/2 = 1/4 will be left

      1/4 * 488 = 122 gm

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