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AP Chemistry716 views·Updated Aug 5, 2026Introduction to Elemental Composition
Practice fundamental concepts of mass percentage and the law of definite proportions to determine the relative mass of elements in a pure substance.
A student analyzes two different samples of a pure liquid compound containing only carbon and oxygen. Sample 1 contains 12.0 g of carbon and 16.0 g of oxygen. Sample 2 contains 24.0 g of carbon and 32.0 g of oxygen. Which of the following laws best explains why both samples have the same mass percentage of carbon?
- A student analyzes two different samples of a pure liquid compound containing only carbon and oxygen. Sample 1 contains 12.0 g of carbon and 16.0 g of oxygen. Sample 2 contains 24.0 g of carbon and 32.0 g of oxygen. Which of the following laws best explains why both samples have the same mass percentage of carbon? — The law of definite proportions
- A 50.0 g sample of an unknown compound contains 20.0 g of calcium, 6.0 g of carbon, and 24.0 g of oxygen. What is the mass percentage of calcium in this compound? — 40%
- A pure sample of a hydrocarbon is 80.0% carbon by mass. If a student analyzes a 25.0 g sample of the same hydrocarbon, what is the mass of hydrogen present in the sample? — 5.0 g
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