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lecture 10

lecture 10 - Stoichiometry SEXTILLION Reaction...

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Lecture 10 602 SEXTILLION: Reaction Stoichiometry Key Idea: Balanced chemical equations keep track of exact quantities of reactants and products expressed in moles. Stoichiometry ! # ! \$ % & ( ! \$ % & ! ! # ! ( \$ % & Individual atoms and molecules react in constant ratios. Balloon #1 Balloon #2 Balloon #3 Measuring Amounts C 6 H 12 O 6 (s) + 6O 2 (g) 6CO 2 (g) + 6H 2 O (l) How much oxygen do you need to breathe to react with 1 gram of glucose that you eat? Counting Large Numbers How can you “count” the grains of rice in a large bag? 602,000,000,000,000,000,000,000 = 6.02 x 10 23 12 g 12 amu carbon atoms 602,000,000,000,000,000,000,000 = 6.02 x 10 23 1 g 1 amu hydrogen atoms 602,000,000,000,000,000,000,000 = 6.02 x 10 23 40 g 40 amu calcium atoms dozen 30 g 2.5 g pennies dozen 6 g 0.50 g paper clips dozen 0.26 g 0.022 g rice Number of pieces in measured mass Measured mass Mass of 1 piece Substance Counting by Weighing What do you notice? An atom of carbon-12 consists of 6 neutrons, 6 protons, and 6 electrons. 12 C atom weighs 12 amu, or 1.99265 x 10 -23 g How many atoms are in 12 g of 12 C atoms?

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