What is the half-life of a radioisotope if a 0.800 g sample decays to 0.100 g in 12.0 minutes?

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Quizplus · Accepted Answer

The half-life can be determined by understanding that the amount of substance halves for each half-life period. Starting with 0.800 g and ending with 0.100 g means the substance has halved three times (0.800 g to 0.400 g, then to 0.200 g, and finally to 0.100 g). Since this takes 12.0 minutes in total, each half-life is 12.0 minutes / 3 = 4.00 minutes.

What Is the Half-Life of a Radioisotope If a 0