# Science math

Suppose a laboratory has a 38 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 1104 days? How much polonium is in the sample 1104 days later?

1. 1104/138 = 8 half-lives
after 8 half-lives, 1/256 remains, or 0.148g

posted by Steve
2. How many half-lives of polonium-210 occur in 1104 days? 1104/138 = 8.0 half-lives

How much polonium is in the sample 1104 days later? 38 g * (1/2)^8 = 0.148 g

posted by drwls
3. Thank you both very much.

posted by Joshua
4. 8; 2,622 g

posted by Joseph
5. 8; 0.11

posted by abbie
6. 8';0.148

posted by christina

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