Posted by **Joshua** on Monday, January 7, 2013 at 2:57pm.

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?

- Science math -
**Steve**, Monday, January 7, 2013 at 3:16pm
1104/138 = 8 half-lives

after 8 half-lives, 1/256 remains, or 0.148g

- Science math -
**drwls**, Monday, January 7, 2013 at 3:18pm
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

- Science math -
**Joshua**, Monday, January 7, 2013 at 3:23pm
Thank you both very much.

- Science math -
**Joseph**, Thursday, April 25, 2013 at 7:20pm
8; 2,622 g

- Science math -
**abbie**, Monday, September 29, 2014 at 6:37pm
8; 0.11

- Science math -
**christina**, Monday, September 29, 2014 at 6:38pm
8';0.148

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