SOLUTION: What is the half-life of a 5g radioactive substance that decomposes at a rate of 3.5x10-2/sec?

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Question 607266: What is the half-life of a 5g radioactive substance that decomposes at a rate of 3.5x10-2/sec?

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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What is the half-life of a 5g radioactive substance that decomposes at a rate of 3.5%2810%5E-2%29/sec?
:
Find how long it takes for half of 5 g to remain at a decay rate of 3.5%2810%5E-2%29 grams/sec
2.5%2F%283.5%2810%5E-2%29%29 = 71.43 seconds