The half-life of a radioactive isotope is 20.0 minutes. what is the total amount of a 1.00-gram sample of this sample of this isotope remaining after 1.00 hour?

0.125 grams

Explanation:

Radioactive decay follows first order kinetics.

Half-life of give isotope = 20 minutes

N = amount left after time t= ?

= initial amount  = 1.0 g

= rate constant

t= time = 1 hour = 60 min

N=0.125g

Thus amount left after 1 hour is 0.125 grams

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explanation: