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See question in image below If 14 g of a radioactive substance are present initially and 2 yr later only 7 g remain, how much

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If 14 g of a radioactive substance are present initially and 2 yr later only 7 g remain, how much of the substance will be present after 5 yr? (@) After 5 yr there will be |:| g of a radioactive substance. (Round the final answer to three decimal places as needed. Round all intermediate values to seven decimal places as needed.)

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