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The half-life of Calcium-47 is 3.91 x 105 seconds. A sample contains 4.11 x 1016 nuclei. How much of the sample is left after 7.82

The half-life of Calcium-47 is 3.91 x 105 seconds. A sample contains 4.11 x 1016 nuclei. How much of the sample is left after 7.82 x 105 seconds? 2.57 x 1015 nuclei 2.06 x 1016 nuclei 1.03 x 1016 nuclei 5.14 x 1015 nuclei

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