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5. The half-life of halfnium-156 is 0.025 seconds. What was the original amount of the substance if after 0.1 seconds 3.125 gram remains? 6. The

5. The half-life of halfnium-156 is 0.025 seconds. What was the original amount of the substance if after 0.1 seconds 3.125 gram remains? 6. The half-life of Co-55 is 175 hours. How much of a 4000 g of Cobalt-55 sample would be left after 525 hours?

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