Radon-22 has a half life of 4 days. If you begin with 32 grams of radon, how many grams will be left after 20 days?

Answer 1

20 days is 5 half-lives.

Divide 32 by two, five times.

That is the same as dividing 32 by 2^5.

Answer 2

thank you drwls for the help