molybdenum_99(mo-90)has a half life of 66 hours?

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buggy asked:


molybdenum_99(mo-90)has a half life of 66 hours. after 132 hours,how much of an initial sample of 10 ci of mo-99 would remain?.

a 10 ci
b 5ci
c
2.5ci
d
1.25ci

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2 Responses to “molybdenum_99(mo-90)has a half life of 66 hours?”

  1. John Says:
    September 15th, 2008 at 1:08 pm

    132 hours is two groups of 66 hours, which means that two half-lives have passed. That means a quarter of the same remains. A quarter of 10 ci is 2.5 ci.

    Answer choice C.

    -John

  2. P Town Says:
    September 15th, 2008 at 6:17 pm

    The answer is C: 2.5 ci. After 66 hours, the 10 ci sample would halve, becoming 5 ci. After another 66 hours (totaling 132 hours) the sample would halve again and become 2.5 ci.

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