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# RelativeResourceManager-2 - 8:47 AM Stoichiometry and...

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1 Stoichiometry Slide S-1 Stoichiometry and Limiting Reagents 7/24/07 8:47 AM Stoichiometry Slide S-2 Stoichiometry From two Greek words: stoicheion ("element") and metron ("measure"). Richter: Stoichiometry is the science of measuring the quantitative proportions or mass ratios in which chemical elements stand to one another. Stoichiometry deals with calculations about the masses, moles, and volumes of reactants and products involved in a chemical reaction. It is the ‘accounting’ of chemistry. Most stoichiometric problems present you with a certain amount of a reactant (or reactants) and then ask how much of a product can be formed, or present you with a desired quantity of product to make and ask you how much reactant you need to achieve this goal.

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2 Stoichiometry Slide S-3 The “Stoichiometric Ratio” 3H 2 ( g ) + N 2 ( g ) !" ! 2NH 3 ( g ) Stoichiometry Slide S-4 Stoichiometric Calculations 1. Write and balance your chemical equation; 2. Calculate molar masses of any materials for which have been given amounts OR will have determine amounts for; 3. Convert any masses given to moles; 4. Use balanced equation to determine stoichiometric ratios needed; 5. Calculate moles of desired materials; 6. Calculate grams of desired materials.
3 Stoichiometry Slide S-5 Stoichiometric Calculation Example If a solution containing 14.7 g of silver nitrate is treated with a solution of sodium phosphate, how much silver phosphate will be made? Na 3 PO 4 (aq) + 3AgNO 3 (aq) ! " ! Ag 3 PO 4 (s) + 3NaNO 3 (aq) 168.9 g/mol 415.7 g/mol MM g (start) mol (start) 14.7 g excess 0 g 0.0870 mol excess 0 mol g (start) mol (end) 0 g excess** ? g 0 mol excess** ? mol Stoichiometry Slide S-6 Na 3 PO 4 (aq) + 3AgNO 3 (aq) ! " ! Ag 3 PO 4 (s) + 3NaNO 3 (aq) 14.7 g AgNO 3 !

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