Review of Fundamentals (2)

Review of Fundamentals (2) - Formulas, Chemical Equations...

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1 The mole: Since atoms are very tiny and light… more convenient to consider a collection of them: 1 mole = 6.022 x 10 23 units of something = Avogadro’s number (N A ) This is the number of atoms in exactly 12.000 g of 12 C. Mass (g) Moles (mol) Number of Atoms Formulas, Chemical Equations and more. .. Atomic weight gives: C 12.011 Molecular weight (MW) of a compound = sum of atomic weights of its constituent elements E.g. C 7 H 16 NO 2 +
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2 Empirical: the chemical formula expressed using the smallest possible whole numbers. E.g. HO for H 2 O 2 gives ratios of atoms, not actual numbers of atoms. Chemical Formulas Molecular: the actual chemical formula E.g. H 2 O 2 indicates the actual number of each element. Empirical formulas can be determined using elemental analysis . E.g.: a compound MO 2 is 40.05% O by mass. What is M? E.g.: a compound MO 2 is 40.05% O by mass. What is M?
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3 Represents a chemical change from reactant to products. Chemical Equation
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This note was uploaded on 12/15/2011 for the course CHM 139 taught by Professor Browning during the Spring '08 term at University of Toronto- Toronto.

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Review of Fundamentals (2) - Formulas, Chemical Equations...

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