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Unit 2: Stoichiometry and Energy

Unit 2: Stoichiometry and Energy. Stoichiometry. Unit 2: Stoich and Energy. Basic Stoichiometry:. Balanced equations are mole ratios. Put everything in moles!!. P 4 (s) + Cl 2 (g)  PCl 3 (l)

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Unit 2: Stoichiometry and Energy

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  1. Unit 2: Stoichiometry and Energy Stoichiometry

  2. Unit 2: Stoich and Energy Basic Stoichiometry: Balanced equations are mole ratios. Put everything in moles!! P4(s) + Cl2(g) PCl3(l) Assuming there is enough Cl2 gas to completely react with 1.45 g of phosphorus, how many grams of PCl3 should be produced? How much of the Cl2 gas was needed to react completely with the 1.45 g of phosphorus?

  3. Unit 2: Stoich and Energy Limiting Reagants: Everyone knows the sandwich analogy . . . 4NH3(g)+ 5O2(g) 4NO (g) + 4H2O (l) If equal masses of each reactant are mixed (750 g), which is the limiting reactant and how many grams of nitrogen monoxide is produced? How much of the excess reagant is left over?

  4. Unit 2: Stoich and Energy Percent yield: Stoichiometry only gives you theoretical yields. Al4C3(s) + H2O (l) Al(OH)3(s) + CH4(g) If 125 grams of aluminum carbide is reacted with 200. grams of water and 13.6 grams of methane is obtained, what is the % yield of this gas?

  5. Unit 1: Basic Concepts of Chemistry Solution Stoichiometry Remember – moles always solve stoichiometry problems. CaCO3 + 2 HCl CaCl2 + H2O + CO2 What mass of calcium carbonate is needed to react completely with 25 mL of 0.75 M HCl?

  6. Unit 1: Basic Concepts of Chemistry Solution Stoichiometry Remember – moles always solve stoichiometry problems. __ Pb(NO3)2 + __ NaI __ PbI2 + __ NaNO3 How many milliliters of 0.10 M Pb(NO3)2 are required to react with 75 mL of 0.20 M NaI?

  7. Unit 1: Basic Concepts of Chemistry Solution Stoichiometry A step up … If 525 mL of 0.80 M HCl solution is neutralized with 315 mL of Sr(OH)2 solution what was the molarity of the Sr(OH)2? __ HCl + __ Sr(OH)2 __ SrCl2 + __ H2O

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