The half life of a substance is 30 days. If there are 4.5 grams to start with, how much will be left after 23 days? Round to the nearest tenth of a gram. Be sure to label your answer.

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Pauliephonic asked Feb 28, 2022

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The half life of a substance is 30 days. If there are 4.5 grams to start with, how much will be left after 23 days? Round to the nearest tenth of a gram. Be sure to label your answer.

Mathematics
high-school

Pauliephonic asked Feb 28, 2022

by Pauliephonic

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2 Answers

9 votes

Important formula:

N_t = N_0 (1/2)^(t)/(t_(1/2))

Here, you are trying to find Nt and you have N0 = 4.5g, t = 23 days, t1/2 = 30 days. Plug the values in and you should get 2.7g left after 23 days.

Volker Voecking answered Mar 1, 2022