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64 Chapter 4 Chemical Quantities and Aqueous Reactions Solution: 3.2 X 55.85 1 X 2 1 mol Fe 80.91 1 g HBr = 9.27 g HBr = 9.3 g HBr 3.2 X 55.85 1 1 1 X 2.016 1 H₂ = 0.116 g H₂ = 0.12 g Check: The units of the answers (g HBr, g H₂) are correct. The magnitude of the answers is reasonable because molar mass HBr is greater than Fe and molar mass H₂ is much less than Fe. 4.33 (a) Given: 3.67 g Ba Find: g BaCl₂ Conceptual Plan: g Ba mol Ba mol BaCl₂ g BaCl₂ 1 mol Ba 1 mol BaCl₂ 208.23 g BaCl₂ 137.33 g Ba 1 mol Ba 1 mol BaCl₂ Solution: 3.67 X 137.33 1 mol Ba Ba X 1 1 X 208.23 1 g BaCl₂ = 5.5647 g BaCl₂ = 5.56 g BaCl₂ Check: The units of the answer (g BaCl₂) are correct. The magnitude of the answer is reasonable because it is larger than grams Ba. (b) Given: 3.67 g CaO Find: g CaCO₃ Conceptual Plan: g CaO mol CaO mol CaCO₃ g CaCO₃ 1 mol CaO 1 mol CaCO₃ 100.09 g CaCO₃ 56.08 g CaO 1 mol CaO 1 mol CaCO₃ Solution: 3.67 56.08 1 g X 1 1 X 100.09 1 g CaCO₃ = 6.550 g CaCO₃ = 6.55 g CaCO₃ Check: Units of answer (g CaCO₃) are correct. The magnitude of the answer is reasonable because it is larger than grams CaO. (c) Given: 3.67 g Mg Find: g MgO Conceptual Plan: g Mg mol Mg mol MgO g MgO 1 mol Mg 1 mol MgO 40.31g MgO 24.31 g Mg 1 mol Mg 1 mol MgO Solution: 3.67 X 24.31 1 1 1 X 40.31 1 g MgO = 6.085 g MgO = 6.09 g MgO Check: The units of the answer (g MgO) are correct. The magnitude of the answer is reasonable because it is larger than grams Mg. (d) Given: 3.67 g Al Find: g Conceptual Plan: g Al mol Al mol g 1 mol Al 2 mol 101.96 g 26.98 g Al 4 mol Al 1 mol Solution: 3.67 g Al X 26.98 1 X 2 4 X 101.96 g = 6.934 g = 6.93 g Check: The units of the answer (g are correct. The magnitude of the answer is reasonable because it is larger than grams Al. 4.35 (a) Given: 4.85 g NaOH Find: g Conceptual Plan: g NaOH mol NaOH mol HCI g HCI 1 mol NaOH 1 mol HCI 36.46 g HCI 40.00 g NaOH 1 mol NaOH 1 mol HCI Solution: 4.85 NaOH X 40.00 1 mol NaOH NaOH 1 1 X 36.46 1 mol g HCI = 4.42 g HCI Check: The units of the answer (g HCI) are correct. The magnitude of the answer is reasonable because it is less than grams NaOH. Copyright © 2017 Pearson Education, Inc.