L18a-c_Unit_7a-3_ALL[1]

3 moles o2 o 1600 pracce problem 4 how many moles of

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Unformatted text preview: contains 4.48 moles of Copper? 4.48 mol Cu 6.022 × 10 23 Cu atoms 1 mole Cu 24 = 2.7 × 10 Cu atoms Prac<ce Problem 1 How many molecules are in 0.357 moles of CO2? Prac<ce Problem 2 A silver ring contains 1.1 x 1022 silver atoms. How many moles of silver does the ring contain? What is the Mole? (part 2) The mole is a unit that represents 2 things: 1.  A specific number of par9cles (atoms, molecules) 1 mole = 6.023 x 1023 par9cles 2.  A definite and specific mass of a substance Each element on the periodic table has a specific mass number ! this number represents the number of grams in 1 mole The Mole and Molar Mass The mole is a unit that represents 2 things: 2.  A definite and specific mass of a substance Each element on the periodic table has a specific mass number ! this number represents the number of grams in 1 mole 1 mole = specified # grams (MOLAR MASS ) This is DIFFERENT for different elements and molecules Consider the water molecule: H2O 1 mole of water contains 6.023 x 1023 water molecules 1 mole of water contains 18 grams of water Molar Mass è༎ Molecular Weight 1 H 1.008 8 O 16.00 To calculate the molar mass (molecular weight) of a compound you sum the molar masses of all the atoms that make up the compound. Water is composed of 2 H and 1 O Mw = 2(1.008 g/mol) + 1(16.00 g/mol) = 18.016 g/mol Consider the water molecule: H2O 1 mole of water contains 6.023 x 1023 water molecules 1 mole of...
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This note was uploaded on 02/01/2014 for the course CHEM 102 taught by Professor Peterpastos during the Fall '08 term at CUNY Hunter.

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