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Answer to Question #70516 in General Chemistry for Meredith

Question #70516
A radioisotope has a half life of only 13.356 minutes, after 6.65 hours only 6.115 mg remains. What is the original mass in kg?
1
Expert's answer
2017-10-11T10:45:07-0400
m = m0*2^(-t/T)

m0 = m/(2^(-t/T)

m0 = 6.155mg/(2^(-23,940sec/801sec)

m0 = 6.155mg/(2^(-29.89)

m0 = 6.155mg/0.000000001

m0 = 6 155 000 000 mg = 6 155kg.

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