1) What is the percent composition of oxygen in the compound H2O? a) 33. 3% b) 66.6% c) 77. 5 % d) 88.9 % 2) Determine the percent composition of carbon in calcium carbonate. a) 15 % C b) 14 % C c) 12 % C d) 19 % C 3) Aspirin is a compound with the molecular formula C₉H₈O₄. What is the percentage composition of each element? a) 40 % C, 4.48 % H, 55.52 % O b) 50 % C, 4.48 % H, 45.52 % O c) 60 % C, 4.48 % H, 35.52 % O d) 80 % C, 4.48 % H, 15.52 % O

Percentage Composition Plenary

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