If you have 10 grams of a substance that decays with a half life of 14 days then how much will you have after 70 days?

If it has a 1/2 life of 14 days, after 14 days there will be half of it left correct?  

Explanation:So, how many half-lifes are in 42 days?  

42 / 14 = 3  

This means it will divide 3 times.  

1st half life period: 10 / 2 = 5g  

2nd period: 5 / 2 = 2.5g  

3rd period: 2.5 / 2 = 1.25g

10 g at start, 5 g at 14 days, 2.5 g at 28 days, 1.25 g at 42 days.

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