lect_10oct17f08

lect_10oct17f08 - 1 Outline 10 17-OCT-2008 1. Review-...

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Unformatted text preview: 1 Outline 10 17-OCT-2008 1. Review- Question? Balancing, Stoichiometry, Chemical (mole) accounting 2. More Stoichiometry Limiting Reagent- least amount, ratios, ICE 3. And More Stoichiometry! Theoretical Yield 2 Review: Writing& Balancing Eqns; Ex. Ammonia reacts with oxygen to produce nitrogen monoxide and water all in gaseous phase. Write balanced chem. eqn., show steps. 1.Skeleton: NH 3 + O 2 NO + H 2 O 2. H atoms: 2 NH 3 + O 2 NO + 3 H 2 O 3. N atoms: 2 NH 3 + O 2 2 NO + 3 H 2 O 4. O atoms: 2 NH 3 + (5/2) O 2 2 NO + 3 H 2 O 5. Integers & States: 4 NH 3 (g) + 5 O 2 (g) 4 NO (g) + 6 H 2 O (g) 3 Stoichiometry: Quantitative Relations in Chemical Reactions Stoichiometry- calculation of quantities of reactants and products involved in chemical reaction. CHEMICAL (MOLE) ACCOUNTING! Need balanced chemical equation and relationship between mass and moles (molar masses) . 4 Name________ Quiz 9 Lab Section_____ Given: N 2 + 3 H 2 2 NH 3 (5) What mass (grams) of H 2 (H, 1.0 g/mol) is needed to react with 5.60 g N 2 ( N, 14.0 g/mol)? Mass = ?*?*?* ? = ? 5 Practice Problem 6 Limiting Reagent Limiting reagent- reactant that is entirely consumed when reaction goes to completion. Deals with starting amounts of two or more reagents. Limiting reagent determines how much product can be obtained. Ex: bicycles require one frame and two wheels. If have 20 wheels but only 5 frames, it is clear that number of frames will determine how many bicycles can be made. (workout with units) 7 Limiting Reagent: Example Zinc metal reacts with hydrochloric acid by following reaction. Ex: If 0.30 mol Zn is added to hydrochloric acid containing 0.52 mol HCl, how many moles of H 2 are produced? Soln: (a) Find mol H 2 produced by Zn & HCl individually then interpret ( least amount ) OR (b) compare given mol ratio with eqn. mol ratio . OR (c) initial, change, end ( ICE ) ) g ( H (aq) ZnCl HCl(aq) 2 Zn(s) 2 2 + + 8 Limiting Reagent : Ex. 1 (cont. 1) Ex: Least amount . Find how much product could get if each reactant were totally consumed. Reactant giving were totally consumed....
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lect_10oct17f08 - 1 Outline 10 17-OCT-2008 1. Review-...

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