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

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Presentation transcript:

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).

% 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 g Unk Compound = 15.9%

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.

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.

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)

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 g Unk Compound

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 g Unk Compound = 27.1% by mass of Hydrogen

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).

Law of Multiple Proportions