Question #7edac

1 Answer
Dec 16, 2017

6.25 grams remaining

Explanation:

Use this exponential decay equation:

y = a(b)^x

Here a is the starting amount you have, which is 100 grams in this case:

y = 100(b)^(x/8) -> You divide x by 8 because the half-life is every 8 years

b is the amount decaying each time, which is half every time:

y = 100(1/2)^(x/8)

x is the number of years, so plug in 32 to find the remaining amount of the sample: (solve for y)

y = 100(1/2)^(32/8) => y = "6.25 g remaining"