The molecular formula for caffeine is C₈H₁₀O₂N₄.How many moles of C atoms are present in a 2.0 g sample of caffeine?

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Quizplus · Accepted Answer

The molecular formula for caffeine is C8H10N4O2. The molar mass of caffeine can be calculated as follows: (12.01 g/mol * 8) + (1.008 g/mol * 10) + (14.01 g/mol * 4) + (16.00 g/mol * 2) = 194.19 g/mol. For a 2.0 g sample of caffeine, the number of moles of caffeine is (2.0 g) / (194.19 g/mol) = 0.0103 mol. Since there are 8 moles of C atoms per mole of caffeine, the number of moles of C atoms in the sample is 0.0103 mol * 8 = 0.082 mol.

The Molecular Formula for Caffeine Is C8H10O2N4

The Molecular Formula for Caffeine Is C₈H₁₀O₂N₄