Chemistry, 28.01.2020 18:56 lunax7x7

An experiment with 55 co takes 47.5 hours. at the end of the experiment, 1.90 ng of 55-co remains. if the half-life is 18.0 hours, how many ng of 55-co were originally present?

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An experiment with 55 co takes 47.5 hours. at the end of the experiment, 1.90 ng of 55-co remains. i...