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Stoichiometry

Stoichiometry. Warm-Up Question(s). Warm-up. How many seconds are there in 72 hours? Show your work. Overview. Stoichiometry is used to make sense of a chemical equation…. Quantitatively . Why use the mole? It is impossible to weigh out an individual molecule or molecules.

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Stoichiometry

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  1. Stoichiometry Warm-Up Question(s)

  2. Warm-up • How many seconds are there in 72 hours? • Show your work.

  3. Overview • Stoichiometry is used to make sense of a chemical equation….Quantitatively. • Why use the mole? • It is impossible to weigh out an individual molecule or molecules. • We use the molar mass to help with this.

  4. p. 334 Solved Problem • You must use a mole (molar) ratio of the reactants to solve for moles of a product. • Ex: 2 Al (s) + 3Cl2 -> 2AlCl3 (s) • 3 moles of Cl2 = 2 moles of AlCl3

  5. Solved Problem p. 337 • You must use a molar mass of a compound to solve for moles of that compound. • Ex: 1 mole of CaCO3 = 40.08g + 12.01g + (16.0g x 3) = 100.09 g • Molar mass of CaCO3 = 100.09 g/mole • Use the molar mass as a conversion factor.

  6. Solved Prob p. 338 • Work on Own • Ques. 362 - 363 #39, 41, 43

  7. Example Problem • A sample of potassium chlorate is heated and decomposes according to the following equation: 2 KClO3 → 2 KCl + 3 O2 • If 11.2 grams of potassium chlorate decompose completely, how many grams of potassium chloride will be produced from this reaction?

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