Chap7Lec - DRAFT (Chap 7) Page 1 Chap. 7 Tools for using...

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Unformatted text preview: DRAFT (Chap 7) Page 1 Chap. 7 Tools for using balanced equations: Avogadro’s number = 6.022 x 10 23 (strict definition – “the number of atoms contained in exactly 12 grams of 12 C.)” 1 doz eggs = 12 eggs 1 mole eggs= 6.022 x 10 23 eggs (there are not that many eggs in the world!) 1 mole Carbon atoms = 6.022 x 10 23 carbon atoms 1 mole of CH 4 molecules = 6.022 x 10 23 CH 4 molecules Some units we use for molecules and atoms and for moles of molecules and moles of atoms : For molecules and atoms use: Atomic Mass Unit: amu (very small unit = 1 g divided by 6.022*10 23 ) For moles of molecules and moles of atoms use: Gram: g (sometimes we use kg) DRAFT (Chap 7) Page 2 Molecular weight (amu)-- the sum of the masses of all the atoms in the molecular formula (molecules) Formula weight (amu)– the sum of the masses of all the atoms in the ionic formula (ionic compounds) The above two are basically the same, however, to be strictly correct, an ionic compound is not a “molecule.” Remember we use ionic formulas to represent the ratios of ions in an ionic compound. What is the molecular weight of C 6 H 12 O 6 ? (Glucose) DRAFT (Chap 7) Page 3 What is the formula weight of barium sulfate? DRAFT (Chap 7) Page 4 What mass percent (percent composition ) of BaSO 4 comes from the Ba atoms? Can use amu or g (as long as you are consistent because we are dealing with PERCENT). Percent composition of Ba (in BaSO 4 ) = mass of Ba x 100% mass of BaSO 4 Percent composition O (in BaSO 4 ) DRAFT (Chap 7) Page 5 DRAFT (Chap 7) Page 6 Some examples of conversion factors with moles: 1 mole eggs 1 mole N 2 molecules 1 mole N atoms 6.022 x 10 23 eggs 6.022 x 10 23 N 2 molecules 6.022 x 10 23 N atoms AND/OR 6.022 x 106....
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This note was uploaded on 11/29/2010 for the course CHEM 101 taught by Professor Stegemiller during the Winter '07 term at Ohio State.

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Chap7Lec - DRAFT (Chap 7) Page 1 Chap. 7 Tools for using...

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