Problem: The half-life for the radioactive decay of radium is 1620 years and is independent of initial concentration. What is the initial concentration if it took 6000 years for the final concentration to reach 0.110 M? 

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The half-life for the radioactive decay of radium is 1620 years and is independent of initial concentration. What is the initial concentration if it took 6000 years for the final concentration to reach 0.110 M? 

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