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試卷名稱：92年 - [無官方正解]92 高雄醫學大學學士後醫學系_招生考試試題：化學#136240
年份：92年
科目：學士後西醫-化學
24. Caffeine consists of carbon, hydrogen, oxygen, and nitrogen. When 0.1920 g of caffeine is burned in an excess of oxygen, 0.3482 g of carbon dioxide and 0.0891 g water are formed. Caffeine is 28.84% nitrogen by mass. Its molar mass is between 190 and 200 g/mol. What is the formula for caffeine?
(A) C4H5N2O
(B) C3H2N2O2
(C) C6H4N4O4
(D) C8H10N4O2
(E) none of these