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joeshmo
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Homework Statement
Initially, a particular sample has a total mass of 200 grams and contains 256 x 1010 radioactive nuclei. These radioactive nuclei have a half life of 1 hour.
(a) After 3 hours, how many of these radioactive nuclei remain in the sample (that is, how many have not yet experienced a radioactive decay)? Note that you can do this problem without a calculator
(b) After that same amount of time has elapsed, what is the total mass of the sample, to the nearest gram?
Homework Equations
.5 ^(time/half life)
and then multiply that to initial amount
3. The Attempt at a Solution [/b
i got part A by dividing the initial amount by 8. I tried doing the same for part B but I keep getting it wrong