Problem: The half-life of radium-226 is 1.60×103 yr. How many hours will it take for a 2.50-g sample to decay to the point where 0.185 g of the isotope remains?

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The half-life of radium-226 is 1.60×103 yr. How many hours will it take for a 2.50-g sample to decay to the point where 0.185 g of the isotope remains?