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Chapter 4 Stoichiometry of Chemical Reactions 227 72. What is the limiting reactant when 1.50 g of lithium and 1.50 g of nitrogen combine to form lithium nitride, a component of advanced batteries, according to the following unbalanced equation? Li+N2 ⟶Li3N 73. Uranium can be isolated from its ores by dissolving it as UO2(NO3)2, then separating it as solid UO2(C2O4)∙3H2O. Addition of 0.4031 g of sodium oxalate, Na2C2O4, to a solution containing 1.481 g of uranyl nitrate, UO2(NO2)2, yields 1.073 g of solid UO2(C2O4)∙3H2O. Na2C2O4 + UO2(NO3)2 + 3H2O ⟶ UO2(C2O4)∙3H2O + 2NaNO3 Determine the limiting reactant and the percent yield of this reaction. 74. How many molecules of C2H4Cl2 can be prepared from 15 C2H4 molecules and 8 Cl2 molecules? 75. How many molecules of the sweetener saccharin can be prepared from 30 C atoms, 25 H atoms, 12 O atoms, 8 S atoms, and 14 N atoms? 76. The phosphorus pentoxide used to produce phosphoric acid for cola soft drinks is prepared by burning phosphorus in oxygen. (a) What is the limiting reactant when 0.200 mol of P4 and 0.200 mol of O2 react according to P4+5O2 ⟶P4O10 (b) Calculate the percent yield if 10.0 g of P4O10 is isolated from the reaction. 77. Would you agree to buy 1 trillion (1,000,000,000,000) gold atoms for $5? Explain why or why not. Find the current price of gold at http://money.cnn.com/data/commodities/ (1 troy ounce = 31.1 g) 4.5 Quantitative Chemical Analysis 78. What volume of 0.0105-M HBr solution is be required to titrate 125 mL of a 0.0100-M Ca(OH)2 solution? Ca(OH)2(aq) + 2HBr(aq) ⟶ CaBr2(aq) + 2H2 O(l) 79. Titration of a 20.0-mL sample of acid rain required 1.7 mL of 0.0811 M NaOH to reach the end point. If we assume that the acidity of the rain is due to the presence of sulfuric acid, what was the concentration of sulfuric acid in this sample of rain? 80. What is the concentration of NaCl in a solution if titration of 15.00 mL of the solution with 0.2503 M AgNO3 requires 20.22 mL of the AgNO3 solution to reach the end point? AgNO3(aq) + NaCl(aq) ⟶ AgCl(s) + NaNO3(aq) 81. In a common medical laboratory determination of the concentration of free chloride ion in blood serum, a serum sample is titrated with a Hg(NO3)2 solution. 2Cl−(aq) + Hg(NO3)2(aq) ⟶ 2NO3 −(aq) + HgCl2(s) What is the Cl− concentration in a 0.25-mL sample of normal serum that requires 1.46 mL of 5.25 × 10−4 M Hg(NO3)2(aq) to reach the end point? 82. Potatoes can be peeled commercially by soaking them in a 3-M to 6-M solution of sodium hydroxide, then removing the loosened skins by spraying them with water. Does a sodium hydroxide solution have a suitable concentration if titration of 12.00 mL of the solution requires 30.6 mL of 1.65 M HCI to reach the end point?PDF Image | Stoichiometry of Chemical Reactions
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