Half-live of Indium-116 is 14 seconds. How long will it take for 32 grams of this istotopw to decay to 1.0 grams. I know the answer is 70seconds but do not know how to get it!

You can iterate as TutorCat suggests, or you can follow this formula
k = 0.693/t_{1/2} Solve for k and substitute it into the equation below.
ln(No/N) = kt
No = 32
N = 1
k from above.
solve for t.

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