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Problem- Archaeologists removed some charcoal from a Native American campfire, burned it in O2, and bubbled the CO2 formed into a Ca(OH)2 solution (limewater). The CaCO3 that precipitated was filtered and dried. If 4.58 g of the CaCO3 had a radioactivity of 3.2 disintegrations/min, how long ago was the campfire?

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