QQuestionChemistry
QuestionChemistry
Caffeine's molecular formula is C^8H^10N^4O^2. The molar mass of caffeine is 194 g/mol. What is the percentage of carbon in caffeine?
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Answer
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Step 1: Determine the molar mass of each element in caffeine.
The molecular formula of caffeine is C^8H^10N^4O^2, so there are 8 carbon atoms, 10 hydrogen atoms, 4 nitrogen atoms, and 2 oxygen atoms in one molecule of caffeine. Molar mass of carbon (C): 12.01 g/mol (from periodic table) Molar mass of hydrogen (H): 1.01 g/mol (from periodic table) Molar mass of nitrogen (N): 14.01 g/mol (from periodic table) Molar mass of oxygen (O): 16.00 g/mol (from periodic table)
Step 2: Calculate the total molar mass of caffeine.
Total molar mass of caffeine = (8 * 12.01 g/mol) + (10 * 1.01 g/mol) + (4 * 14.01 g/mol) + (2 * 16.00 g/mol) Total molar mass of caffeine = 96.08 g/mol + 10.10 g/mol + 56.04 g/mol + 32.00 g/mol Total molar mass of caffeine = 194.22 g/mol
Final Answer
The percentage of carbon in caffeine is approximately 49.43%.
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