Caffeine,the active ingredient in coffee,is composed of eight atoms of carbon,ten atoms of hydrogen,and four atoms of nitrogen,and two atoms of oxygen.The chemical formula of caffeine is written
A) CHNO
B) C8H10N4O2
C) C8H10N4
D) C8H12N4O4
E) C8H10N4O
Correct Answer:
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Calcium carbonate
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