lecture5 - Fri Sept 12 2003 Todays Lecture Stoichiometry...

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Fri. Sept. 12, 2003 Today’s Lecture Stoichiometry • 3.7 Balancing Chemical Equations • 3.8 Stoichiometric Calculations • 3.9 Limiting Reagents
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• Balancing Chemical Equations: – Example: • Unbalanced reaction: (NH 4 ) 2 Cr 2 O 7(s) Cr 2 O 3(s) + N 2(g) + H 2 O (g) Reactants Products Status N 2 2 balanced Cr 2 2 balanced H 8 2 unbalanced O 7 4 unbalanced • multiply H 2 O by 4 balanced equation: (NH 4 ) 2 Cr 2 O 7(s) Cr 2 O 3(s) + N 2(g) + 4H 2 O (g)
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– Steps for balancing equations: • determine what reaction is. List reactants and products (with physical states) • write the unbalanced equation to summarize the reaction • balance the equation by inspection, starting with the most complicated molecules • determine what coefficients are necessary to balance the # of each type of atom on either side of the equation
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Al 2 (SO 4 ) 3(aq) + Ca(OH) 2(aq) Al(OH) 3(aq) + CaSO 4(s) Al 2 (SO 4 ) 3(aq) + 3Ca(OH) 2(aq) 2Al(OH) 3(aq) + 3CaSO 4(s) – Check:
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This note was uploaded on 01/16/2010 for the course CHEM CHEM 121 taught by Professor Peggy during the Spring '09 term at Simon Fraser.

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lecture5 - Fri Sept 12 2003 Todays Lecture Stoichiometry...

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