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What mass remains after 868 hours have passed since the

Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If you begin with 46.5 mg of this isotope, what mass remains after 86.8 hours have passed? Since the decomposition is a radioactive decay reaction, it is first order.

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Chemistry: What mass remains after 868 hours have passed since the

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