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S TOICHIOMETRY

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R EMEMBER Chemicals react in molar ratios Ex)

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4F E + 3O 2 2F E 2 O 3 This balanced equation gives us the _________ ratio of reactants Can’t be directly measured, but grams can be

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4F E + 3O 2 2F E 2 O 3 M OLAR R ATIOS mols Fe : mols O 2 mols Fe : mols Fe 2 O 3 mols O 2 : mols Fe 2 O 3 So, if I have 2.5 mols of Fe, how many mols of Fe 2 O 3 can I potentially produce?

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H INT ALWAYS BALANCE YOUR EQUATION FIRST!!! Determine what the question is asking for and what you are starting with Mol to mol Mole to grams Grams to grams

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M OL – MOL CONVERSION C 3 H 8 + O 2 CO 2 + H 2 O What is the ratio of moles of C 3 H 8 to CO 2 ? How many moles of CO 2 are produced if 10.0 moles of C 3 H 8 are used? How many moles of O 2 are needed to produce 7.2 moles of CO 2 ?

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M OL – GRAM CONVERSION C 3 H 8 + O 2 CO 2 + H 2 O How many grams of water are produced given 3.4 moles of C 3 H 8 ? How many moles of oxygen are needed to produce 12.5 grams of carbon dioxide?

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G RAM - GRAM CONVERSION C 3 H 8 + O 2 CO 2 + H 2 O How many grams of carbon dioxide are produced if 12 grams of C 3 H 8 are burnt in the combustion reaction? How many grams of oxygen are needed to produce 25.5 grams of water?

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