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Ch. 9 Stoichiometry

Ch. 9 Stoichiometry. Stoichiometry is a branch of chemistry that deals with the mass relationships of elements in compounds and the mass relationships between reactants and products in chemical reactions. 2 Types of Stoichiometry

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Ch. 9 Stoichiometry

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  1. Ch. 9 Stoichiometry • Stoichiometry is a branch of chemistry that deals with the mass relationships of elements in compounds and the mass relationships between reactants and products in chemical reactions. • 2 Types of Stoichiometry • 1. Composition Stoichiometry – is the mass relationships of elements in chemical compounds. • Ex. Molar mass of Li is 6.941 grams

  2. 2. Reaction Stoichiometry – is the mass relationship among reactants and products of a chemical reaction. • Ex. NaCl + H2O  HCl + NaOH • 58.44g 18.02g 36.46g 40.00g • 4 Reaction – Stoichiometry Problems • 1. Mole to Mole • 2. Mass to Mass • 3. Mole to Mass • 4. Mass to Mole

  3. EXAMPLES ??? • Sample Problems 9.1 – 9.5 • Limiting Reactant is the reactant that limits the amount of the other reactants that can combine, and the amount of products formed in a chemical reaction. • Excess Reactant is the substance that is not used up completely in a reaction. • Ex. If a bus holds 50 people and 60 are waiting to ride the bus, 10 will be left in excess. • Sample problems 9.6 – 9.7

  4. Percent Yield is the ratio of the actual yield to theoretical yield times 100%. • (Actual yield / Theoretical yield) X 100% • Theoretical yield is the maximum amount of product that can be produced from a given amount of reactant. • Actual yield is the measured amount of a product obtained from the product of a reaction. • Sample Problem 9.8

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