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# chapter3 - Chapter 3 Stoichiometry 3.1 Atomic Masses-amu...

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Chapter 3 Stoichiometry 3.1 Atomic Masses -amu based in 12 C -Mass determined by the mass spectrometer -atomic mass- weighted average of all isotopes found in nature Calculation atomic mass: Atomic mass = (% abundance "Ia ")(mass "Ia ")+(%"Ia ")+(% “Ib”)(Mass “Ib”) + …. . -Relative Abundance determined by mass spec. -relative abundance determined by mass spectrometer 3.2 The Mole mole(mol) - equal to the number of atoms in exactly 12 grams of 12 C Avagadro's number- 6.022 *10 23 the mass of 1 mole of an element is equal to its atomic mass a grams Sample 3.4 A silicon chip used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many silicon atoms are present in the chip? 3.3 Molar Lass molar mass- mass in grams of one mole of a compound Do sample 3.7 -3.8 3.4 Percent Composition of Compounds * Sample 3.9 Carovone is a substance that occurs in two forms having different arrangements of atoms but the same molecular formula (C10H14O) and mass. One type of carovone gives caraway seeds their characteristic

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## This note was uploaded on 09/27/2010 for the course CHEM 210 taught by Professor Mcomber during the Spring '10 term at Skyline College.

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chapter3 - Chapter 3 Stoichiometry 3.1 Atomic Masses-amu...

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