GenChem1Cpt4 - Cpt 4 CHEMICAL STOICHIOMETRY Definition...

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Cpt 4. CHEMICAL STOICHIOMETRY s Definition : Study of proportions of * atoms inside substances ; * substances in solutions or chemical reactions s Objectives: s Calculate: * the concentrations of solutions * the quantitative outcome of chemical reactions 4.1. Mole and Molar mass s Thought teaser Weight Species Number 1 g H 6.022E23 atoms 16 g O , , , , 18 g H2O , , molecules 23 g Na(+) , , cations 35.5 g Cl(-) , , anions What trend is uncovered by the information from the table? See RQ2-19 RQ2-19 What trend is uncovered by the information from the table on the previous slide? a. Any amount of substance with a density equal to its atomic or molecular density contains the same number of components: 6.022E23 b. Any amount of substance with a weight equal to its atomic or molecular weight contains the same number of components: 6.022E23 c. Substances with the same weight contain the same number of components: 6.022E23
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The Mole s mole = 6.022E23 = Avogadro's number of components (atoms in an element, molecules in a compound) of a substance. s Number of components of a substance in a weight in grams equal to the atomic or the molecular weight of the substance. s Molar mass (MW) : mass of a mole : same magnitude but different units as the atomic or molecular mass. s unit of molar mass: g/mo l s Mass - Molar mass relation: s # of moles = (mass/molar mass) RQ2-19B: Previous Material Review s On the chemical standpoint a mole is a: a, rodent that lives in underground burrows; b, measure of amount of substance ; c, measure of weight of substance s The number of moles of a substance shows how much of a substance there is by showing the: a, weight of substance; b, volume of substance; c, the number of components (atoms or molecules) of the substance. WORD OF WISDOM Learning Steps s Resolve , Dare to make the first step in the learning process : REVIEW s Reviewing leads to UNDERSTANDING s Don’t understand ? Ask quickly for help to keep the momentum
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WORD OF WISDOM Before the Gain s Unconfortable when studying? Expect the unconfort. s Welcome the unconfort. It is beneficial to your learning s You’re changing your thoughts From UNFOCUSED TO FOCUSED s Say in your mind : “ I’m happy to do it”. You feel a smile forming in your mind WORD OF WISDOM s Not enough time ? s MAKE the time! s Sacrifice something. s Your better future : worth the sacrifice s Tolerate Hardship on the way to Prosperity WORD OF WISDOM Hard Work s Work is too hard ? s Keep trying. It’ll get easier and easier s Ask for help s When the going gets tough , the tough gets going
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Concept Illustration A 60 kg person has in average 36 kg of water. How many moles of water does that represent? #mol = wt / MW; MW(H2O) = 18.02
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This note was uploaded on 03/25/2010 for the course CHEM CHEM 181 taught by Professor Tamburro during the Spring '10 term at Ocean County College.

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GenChem1Cpt4 - Cpt 4 CHEMICAL STOICHIOMETRY Definition...

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