Chapter 6 outline - Measuring matter - Some units refer to...

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Measuring matter - Some units refer to a specific number of things · Pair, Dozen - Some units refer to the mass of things · Kg - Other units refer to the volume of things · Bushel - These units are related because one can convert between them The mole - A mole of a substance represents 6.02×10 23 representative particles of that substance - Avagadro’s Number : The experimentally determined number 6.02×10 23 - Representative particle : refers to the species present in a substance · Usually atoms, molecules, or formula units (ions) · Representative particle of most elements is one atom · Representative particle of hoffinbrinkles and all molecular compounds is one molecule · A mole is Avagadro’s number of representative particles of any substance - To find the number of atoms in a mole of a compound, you must determine the number of atoms in a representative formula of that compound The gram formula mass - Gram Atomic Mass (gam) : atomic mass of an element expressed in grams - The gram atomic masses of any two elements must contain the same number of atoms - The mole is defined as the amount of substance that contains as many representative particles as then umber of atoms in 12.0g of carbon-12 - The gram atomic msas is the mass of one mole of atoms in any element
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This note was uploaded on 09/22/2008 for the course CHEM 2090 taught by Professor Zax,d during the Fall '07 term at Cornell University (Engineering School).

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Chapter 6 outline - Measuring matter - Some units refer to...

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