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Mass Reactants = Mass Products

Mass Reactants = Mass Products. Law of Conservation of Mass: the mass of the reactants must equal the mass of the products. Law of Definite Proportions : a compound ( like H 2 O ) is always composed of the same elements in the same proportion by mass (no matter what the sample size).

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Mass Reactants = Mass Products

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  1. Mass Reactants = Mass Products Law of Conservation of Mass: the mass of the reactants must equal the mass of the products.

  2. Law of Definite Proportions: a compound (like H2O) is always composed of the same elements in the same proportion by mass (no matter what the sample size).

  3. % by Mass = mass of element (g) x 100 mass of compound (g) Example: 78.0g of Unknown Compound 12.4g of Hydrogen (H) ? = % by mass of H • % by Mass H = mass of hydrogen (g) x 100 mass of unk compound (g) • = 12.4 g H x 100 • 78.0g Unk Compound • = 15.9%

  4. Practice:A 24.0g sample of unknown compound contains 6.5 g of hydrogen. What is the percent by mass of hydrogen in the compound? • Start by writing down your information.

  5. Practice:A 24.0g sample of unknown compound contains 6.5 g of hydrogen. What is the percent by mass of hydrogen in the compound? • 24.0 g of Unknown Compound • 6.5 g of Hydrogen (H) • ? = % by mass of H • Now, set up the equation & plug in the numbers.

  6. Practice:A 24.0g sample of unknown compound contains 6.5 g of hydrogen. What is the percent by mass of hydrogen in the compound? • 24.0 g of Unknown Compound • 6.5 g of Hydrogen (H) • ? = % by mass of H • % by Mass H = mass of hydrogen (g) x 100 mass of unk compound (g)

  7. Practice:A 24.0g sample of unknown compound contains 6.5 g of hydrogen. What is the percent by mass of hydrogen in the compound? • 24.0 g of Unknown Compound • 6.5 g of Hydrogen (H) • ? = % by mass of H • % by Mass H = 6.5 g Hydrogen x 100 24.0 g Unk Compound

  8. Practice:A 24.0g sample of unknown compound contains 6.5 g of hydrogen. What is the percent by mass of hydrogen in the compound? • 24.0 g of Unknown Compound • 6.5 g of Hydrogen (H) • ? = % by mass of H • % by Mass H = 6.5 g Hydrogen x 100 24.0 g Unk Compound • = 27.1% by mass of Hydrogen

  9. Law of Multiple Proportions:when different compounds are formed by a combination of the same elements, different masses of one element combine with the same relative mass of the element in a ratio of small whole numbers (can use colons or fractions).

  10. Law of Multiple Proportions

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