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10.3 Percent Composition and Chemical Formulas

10.3 Percent Composition and Chemical Formulas. Percent Composition The % composition of a compound describes the relative amounts of the elements in the compound. Calculating Percent Composition.

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10.3 Percent Composition and Chemical Formulas

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  1. 10.3 Percent Composition and Chemical Formulas

  2. Percent CompositionThe % composition of a compound describes the relative amounts of the elements in the compound.

  3. Calculating Percent Composition When a 13.60-gram sample of a compound containing only magnesium and oxygen is decomposed, 5.40 grams of oxygen is obtained. What is the percent composition of this compound?

  4. Calculating Percent Composition, cont. When a 13.60-gram sample of a compound containing only magnesium and oxygen is decomposed, 5.40 grams of oxygen is obtained. What is the percent composition of this compound? = 39.7% O = 60.3% Mg

  5. Percent Composition From a Formula Calculate the percent composition of propane (C3H8).

  6. Calculating Percent Composition: Propane Calculate the percent composition of propane (C3H8). = 81.8% C = 18% H

  7. Mass From Percent Composition Calculate the mass of carbon and the mass of hydrogen in 82.0 grams of propane (C3H8).

  8. Mass From Percent Composition, cont. Calculate the mass of carbon and the mass of hydrogen in 82.0 grams of propane (C3H8). 15 g H

  9. Empirical Formulas An empirical formula gives the lowest whole-number ratio of the atoms of the elements in a compound. This is not usually the real formula, it is a mathematical formula. Ethyne (C2H2) Styrene (C8H8)

  10. Calculating Empirical Formula A compound is analyzed and found to contain 25.9% nitrogen and 74.1% oxygen. What is the empirical formula of the compound?

  11. Calculating Empirical Formula, cont. A compound is analyzed and found to contain 25.9% nitrogen and 74.1% oxygen. What is the empirical formula of the compound?

  12. Molecular Formulas The molecular formula for a compound shows the actual numbers of atoms in a molecule of the compound.

  13. Calculating Molecular Formula Calculate the molecular formula of a compound whose molar mass is 60.0 g/mol and empirical formula is CH4N.

  14. Calculating Molecular Formula, cont. Calculate the molecular formula of a compound whose molar mass is 60.0 g/mol and empirical formula is CH4N.

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