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試卷名稱：108年 - 108 台灣聯合大學系統學士班轉學考試題：普通化學#99851
年份：108年
科目：轉學考-普通化學
39.An experiment with 
takes 47.5 hours. At the end of the experiment, 1.90 ng of 
remains. If the half life is 18.0 hours, how many ng of 
were originally present?
(A) 2.47 ng
(B) 3.05 ng
(C) 3.28ng
(D) 11.8 ng