Question

If you have 400 grams of a substance that decays with a half-life of 14 days, then how much will you have after 56 days? To help you answer the question, complete the table below. If appropriate, include units.
Chart:

Half Lives 0 1 ___ 3 ___

Total Time 0 ___ 28 days ___ ___

_______ ___ 200g ___ ___ ___

Answer 1

Answer:

25 grams

Explanation:

You strat off with 400 grams of your substance. By day 14, half has dcayed and you only have 200 grams left. By day 28, there are 100 grams of the substance. On day 42, there are 50 grams left. Finally, on day 56, the substance has been through four half-lives and 25 grams remain.