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An Experiment with 55Co Takes 47

Question 56

Multiple Choice

An experiment with 55Co takes 47.5 hours.At the end of the experiment,1.90 ng of 55Co remains.If the half life is 18.0 hours,how many ng of 55Co were originally present?


A) 2.47 ng
B) 3.05 ng
C) 3.28 ng
D) 11.8 ng

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