class4a - Class #4 Reaction Stoichiometry CHEM 107 A....

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Class #4 Reaction Stoichiometry CHEM 107 A. Bengali Texas A&M University Qatar
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Reaction Stoichiometry ) Balanced equation! ) Moles react with moles calculations centered on moles ) Use sample weight, molecular weight, volume, density, etc. to relate data to # of moles.
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Example: ) Propane is burned in gas grills. The equation for burning propane is: C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O ) How many grams of O 2 are required to burn a 400 g cylinder of propane?
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Propane Problem C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O 400 g ? g Do calculation in MOLES! Need molar masses. C 3 H 8 = 44 g/mol, O 2 = 32 g/mol
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Propane Problem C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O 400 g ? g C 3 H 8 = 44 g/mol, O 2 = 32 g/mol 400 g C 3 H 8 x 1 mol C 3 H 8 44 g C 3 H 8 = 9.09 mol C 3 H 8
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Propane Problem C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O 9.09 mol ? g 9.09 mol C 3 H 8 x 5 mol O 2 1 mol C 3 H 8 = 45.45 mol O 2
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Propane Problem C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O 9.09 mol 45.45 mol Convert that to mass to finish: 45.45 mol O 2 x 32 gO 2 1 mol O 2 = 1455 g O 2
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This note was uploaded on 03/29/2008 for the course CHEM 107 taught by Professor Generalchemforeng during the Spring '07 term at Texas A&M.

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class4a - Class #4 Reaction Stoichiometry CHEM 107 A....

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