c161l07_09_16b

C161l07_09_16b - How to balance How Balance the element that appears in the fewest formulas first Balance the element that appears in the most

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How to balance How to balance W Balance the element that appears in the fewest formulas first W Balance the element that appears in the most formulas last W Example CH 4 + O 2 CO 2 + H 2 O C in 2, H in 2, O in 3. C is already balanced CH 4 + O 2 CO 2 + 2H 2 O 2O 4O CH 4 + 2O 2 CO 2 + 2H 2 O
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What is What is stoichiometry stoichiometry ? ? W The mole-to-mole relationships that chemical equations describe are the essence of stoichiometry W The chemical equation 2H 2 (g) + O 2 (g) 2H 2 O(l) tells us the for every 2 moles of H 2 used, we need 1 mole of O 2 and produce 2 moles of water
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The stoichiometric factors The stoichiometric factors W The numbers (coefficients) we’ve used to balance reactions tell us everything W They tell us the mole to mole ratios
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What can we do? What can we do? W moles to moles stoichiometric factors tell us W mass to mass mass of compound A converted to moles Stoichiometery tells us mole to mole moles of B converted to mass W Other calculations volume (through concentration or density)
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How How stoichiometry stoichiometry works works
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This note was uploaded on 11/12/2011 for the course CHEM 160:161 taught by Professor Siegel during the Fall '09 term at Rutgers.

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C161l07_09_16b - How to balance How Balance the element that appears in the fewest formulas first Balance the element that appears in the most

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