CHEM 1211 Lecture 10 Outline of Last Lecture I Example Reactions A Clicker Questions II Chemical Calculations A Mom s Pound Cake III Conceptual Understanding Outline of Current Lecture I Stoichiometry II Clicker Questions III Concept Building IV Aqueous Reactions A Molarity Current Lecture I Stoichiometry gA molA molB gB gA molA molB gB 1 How many CO molecules are required to react with 25 formula units of Fe2O3 Fe2O3 s 3CO g 2Fe s 3CO2 g 25 f u Fe2O3 x 3 molecule CO 75 molecules CO 1 f u Fe2O3 2 146g of iron III oxide reacts and produces 99 8 g of iron What is the percent yield for the reaction molar masses Fe2O3 159 1 Fe 55 84 CO 28 00 Fe2O3 s 3CO g 2Fe s 3CO2 g 146g Fe2O3 1 mol Fe2O3 2 mol Fe 159 1g Fe2O3 mol Fe2O3 Yield 99 8g Fe x 100 97 4 55 84g Fe 102 48g Fe mol Fe Theoretical Yield 102 48g Fe 3 Fe2O3 s 3CO g 2Fe s 3CO2 g How many pounds of iron III oxide is required to produce 125 pounds of CO2 molar masses Fe2O3 159 1 Fe 55 84 CO2 44 00 125 lbs CO2 454 59g CO2 1 mol CO2 1 mol Fe2O3 159 1g Fe2O3 1 lb CO2 44 00g CO2 3 mol CO2 1 mol Fe2O3 1lb Fe2O3 454 59g Fe2O3 151 lb Fe2O3 II III IV Clicker Questions 1 3N2 9H2 6NH3 N2 3H2 2NH3 2 Limiting Reagent a NH3 Product has to be reactants b H2 all used up c N2 all used up d None 3 Under Concept Building 1b 4 Under Concept Building 2a 5 Under Concept Building 2b Concept Building 1 What is the maximum mass of sulfur dioxide that can be produced by a reaction of 95 6g of carbon disulfide with 110 g of oxygen CS2 3O2 CO2 2SO2 a 95 6g of CS2 1 mol CS2 2 mol SO2 64 19g SO2 161g SO2 76 20g CS2 1mol CS2 1 mol SO2 b 110 g of O2 1 mol O2 2 mol SO2 64 10g SO2 147g SO2 32g O2 3 mol O2 1 mol SO2 2 An aqueous solution of iron III chloride and sodium sulfide react to form iron III sulfide and sodium chloride a What is the sum of the coefficients 1FeCl2 1Na2S 1FeS 2NaCl 5 b If you combine 40 g each of Sodium sulfide and iron III chloride who is the limiting reagent FeCl2 Aqueous Reactions A Molarity mol solute M mol mmol L of solution L mL 1 Calculate molarity of a solution that contains 12 5g of sulfuric acid in 1 75L of solution 12 5g H2SO4 1mol H2SO4 7 28 x 10 2M H2SO4 1 75L 98 1g H2SO4 2 Mass of calcium nitrate required to prepare 3 50L of 0 800M calcium nitrate M x V mol 0 800M Ca NO3 2 x 3 50L 2 8 mol Ca NO3 2 0 800M Ca NO3 2 x 3 50L x 164 09g Ca NO3 2 459g Ca NO3 2 L 1 mol Ca NO3 2
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