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lect_7oct15f09 - Outline 7 15-OCT-2009 1 ReviewWriting...

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1 Outline 7 15-OCT-2009 1. Review- Writing & Balancing Steps, Examples 2. Stoichiometry (cont.) Chem. Eqns. & Moles, Examples mass A →mol A → mol B → mass B 3. Stoichimetry(cont.) Limiting Reagent (least amount, ratio, ICE {Initial, Change, End}) 4. Theoretical Yield
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2 Writing & Balancing (Review) 1 . Write skeleton equation: formulas in format of reactants → products 2. Balance atoms Start with most complex substance. End with least complex substance. (Often do O & H last.) (Can use fractions such as (1/2) O 2 ) 3. Adjust coefficients to get integers. 2*(1/2) O 2 = O 2 4. Double check 5. Provide states (g), (l) , (s), (aq)
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3 Writing & Balancing (Review)Ex.1 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)
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4 Writing & Balancing (Review) Ex.2 Ex.2 : Liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas and hydrogen gas.Write a balanced chemical eqn. Use complete formulas and phase labels. Show steps. Skeleton1: Si 2 Cl 6 (l) + H 2 O(l) → SiO 2 (s) + HCl(g) + H 2 (g) Cl: Si 2 Cl 6 (l) + H 2 O(l) → SiO 2 (s) +6 HCl(g) + H 2 (g) Si: Si 2 Cl 6 (l) + H 2 O(l) →2SiO 2 (s) +6 HCl(g) + H 2 (g) O:Si 2 Cl 6 (l) + 4H 2 O(l) →2SiO 2 (s) +6 HCl(g) + H 2 (g) H:Si 2 Cl 6 (l) + 4H 2 O(l) →2SiO 2 (s) +6 HCl(g) + H 2 (g)
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5 Balancing : More Examples Balance the following equations. Use slide 2 and arrows or follow previous 2 examples. On board. • __P 4 O 10 (s) +__H 2 O( l ) →__ H 3 PO 4 ( l ) • __CH 3 NH 2 (g) +__O 2 (g) → __CO 2 (g)+__ H 2 O(g)+ __N 2 (g) • __BCl 3 (g) + __H 2 O( l ) → __H 3 BO 3 (s) + __HCl(g)
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6 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) . Fundamental to chemistry!
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7 Stoichiometric Scheme (Again) mass A Mass A Mass A Mole A Mole B Mass B a A + b B → c C + d D b/a See more complete Stoichiometric Scheme in ilearn (Course Materials)
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8 Stoichiometric calculation (Again) VERY HELPFUL DIAGRAM! See more extensive Stoichiometric Scheme in ilearn (Course Materials). From Chem. Eqn.
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9 Stoichiometry: Ex.2 (s1) Ex: If 5.92 g of copper (II) nitrate (187.6 g/mol) are Ultimately obtained, what mass of nitrogen monoxide (30.0 g/mol) can be obtained by this eqn.?
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