Posted by Joshua on Monday, January 7, 2013 at 2:57pm.
Suppose a laboratory has a 38 g sample of polonium210. The halflife of polonium210 is about 138 days. How many halflives of polonium210 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 halflives
after 8 halflives, 1/256 remains, or 0.148g

Science math  drwls, Monday, January 7, 2013 at 3:18pm
How many halflives of polonium210 occur in 1104 days? 1104/138 = 8.0 halflives
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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