ࡱ> gif%` bjbj"x"x 3P@@ O|||$ ....,. Dh/////e3e3e3 D D D D D D D$Eh\Ht1D|e32e3e3e31D//;FDm5m5m5e3|/|/ Dm5e3 Dm5m5r?T<@|@// ?D.34#@OA\D0D1@H4HH@H|@e3e3m5e3e3e3e3e31D1D]5e3e3e3De3e3e3e3   .   . 4T The Mole Mole: The chemists counting unit, the number of particles in a substance. Symbol: mol Unit: mol Atomic mass (atomic mass unit/ grams): the average of the atomic masses of all the isotopes of that element. Given on the Periodic Table Molar mass (formula mass/ grams): The sum of the atomic masses of all the atoms in a molecule. The number of grams you need to make one mole of atoms of an element is equal to the atomic mass of the element. Avogadros number: the number of representative particles contained in one mole of a substance 1 pair = 2 1 dozen = 12 1 mole = 6.02x1023 Tally Marks For one minute see how many tally marks you can make. Who has the most How long would it take to write to 6.02x1023 tallies? 300 tallies in one minute. Hour? Days? Years? 300 tally60 min24 hours365 days1 min1 hour1 day1 year 6.02 x 1023 Answer 1 mole = atomic mass (g) for an element Molar mass (g) for a compound 1 mole ? grams Al 26.98 g Ba 137.33 g Nitrogen gas 28 g Sulfur dioxide 64.06 Cu 63.5 g  Mole Map GAS (LITERS) ( MOLE ( FORMULA MASS (GRAMS)  ( # OF ATOMS/ELEMENTS/FORMULA UNITS/ MOLECULES/ COMPOUNDS Mole Ratios: In a compound, the number of atoms is in mole rations, H2O there are 2 moles of hydrogen and 1 mol of Oxygen Completing the Math Conversion factor is a ration of equivalent measurements used to invert a quantity from one unit to another, also known as T-charts. Write down everything you know and want Create a T-chart Given Wanted ratioStandard known ratio Example 1: Calculate the amount of eggs in dozens in a box containing 432 eggs. 432 eggs X dozen eggs 432 eggs1 dozen egg36 dozen eggs12 eggs Example 2: Find the amount of moles in a sample containing 3.01x1024 carbon atoms. 3.01 x 1024 C atoms X mol C 3.01 x 1024 C atoms1 mol C5 mol C6.02 x 1023 atoms Mole to Grams and Back Examples: Example 1: Calculate the mass of 5 moles of CO2. 5 mols CO2 X grams CO2 5 mols CO244 g CO2220 g CO21 mol CO2 Example 2: Calculate the number of molecules in 5 moles of CO2. 5 mols CO2 X formula units CO2 5 mols CO26.02 x 1023 formula units CO23.01 x 1024 molecules CO21 mol CO2 Example 3: Calculate the number of molecules in 25 g of CO2. 25 g CO2 X formula units CO2 25 g CO21 mol CO26.02 x 1023 f.u. CO23.42 x 1023 molecules44 g CO21 mol CO2 Example 4: Calculate the number of atoms in 25 g of CO2. 25 g CO2 X atoms CO2 25 g CO21 mol CO26.02 x 1023 f.u. CO23 atoms CO23.42 x 1023 formula units44 g CO21 mol CO21 f.u. CO2 Practice Problems: How many moles are there in 35.5 g H2CO3? (0.572) How many grams are there in 0.0151 moles of water? (0.272) How many grams are there in 2.5 moles of sodium hydrogen carbonate? (209.9) How many moles are there in 1559 g barium chloride? (7.49) How many moles are in 44.8 g aluminum sulfate? (0.131) How many moles are in 1.00 g NaCl? (0.0171) How many formula units are there in 55 g CaCl2? (2.98x1023) What is the mass of 4.5x1026 formula units of Na2O? (46,328) How many molecules are in 12.5 g H2O? (1.25x1024) How many molecules are in 345 g Zn(NO3)2? (9.87x1024) 22.4L Multiply 6.02 x 1023 Divide 6.02 x 1023 Multiply mass Divide mass   l X ) * R T U V b e  N W Y [ b c    ⡙~~~~ h_{5 h_{>* h_{h_{h_{h_{>*H*h_{h_{>*h_{ hROH*hRO h\h hh hH*hh\hh\5 h+5hhh5h+hh+5hPS hPS5>* h5>*1  TUaklV X * 5 B U V b  & FgdRO & FgdPS^gd & Fgdgd`gd+gd+$a$gd     ( 1 $$Ifa$gd_{gd & Fgd & FgdRO 1 2 8 ? 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