Chem 201 - Exam 1 - Chapter 3
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7 Terms
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Molecular/Formula Mass
the sum of the atomic masses in a chemical formula
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Moles and Avogadro’s Number
provides link between mass and number of elementary entities
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A mole is
an amount of substance that contains as many elementary entities as there are atoms in exactly 12g of carbon-12
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if an element is present in just one compound on each side…
balance that element first
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if a group of atoms (polyatomic ion) remains unchanged…
balance as a unit
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H and O are everywhere…
balance other elements first
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balance free elements
last
Note 
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