Stoichiometry

Stoichiometry - Stoichiometry Stoichiometry is the study...

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1 Stoichiometry Stoichiometry is the study and calculation of quantitative (i.e. measurable) relationships between the reactants and products in chemical reactions (chemical equations). The word is derived from the Greek word stoikheion ("element") and metri ā ("measure," from metron). Stoichiometry is concerned with numerical relationships of chemical formulas and chemical equations 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.
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2 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 Na 3 PO 4 (aq) + 3AgNO 3 (aq) ⎯ → Ag 3 PO 4 + 3NaNO 3 (aq) 3 33 3 34 4 3 1 mole AgNO 14.7 g AgNO × = 0.0870 mol AgNO 168.9 g AgNO 1 mole Ag PO 0.0870 mol AgNO × = 0.0290 mol Ag PO 3 mol AgNO 415.7 g Ag PO 0.0290 mol Ag PO × = 12.1 g Ag PO 1 mol Ag PO g AgNO 3 Æ mol AgNO 3 Æ mol Ag 3 PO 4 Æ g Ag 3 PO 4
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3 Limiting Reagent Typically, a chemical reaction is carried out such that one of the starting materials is present in a smaller stoichiometric amount
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This note was uploaded on 01/30/2012 for the course CHEM 4 taught by Professor Staff during the Spring '08 term at UCSD.

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Stoichiometry - Stoichiometry Stoichiometry is the study...

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