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    Understanding Radioactive Decay Calculations

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    The half-life of Iodine-126 is 60 days. If the original sample had a mass of 50.0 grams, how much is left after 360 days?

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    Solution Preview

    To solve this problem, compare the half-life to the # of days:
    half-life = 60 days
    # of days = 360 ...