lecture 10 - Stoichiometry Lecture 10 602 SEXTILLION:...

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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
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This note was uploaded on 09/30/2008 for the course CHEM 11006 taught by Professor Majda during the Fall '08 term at University of California, Berkeley.

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lecture 10 - Stoichiometry Lecture 10 602 SEXTILLION:...

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