D) the formation of NaBr from its constituent elements in their standard state E) None of the above are exothermic Answer: D Diff: 2 Page Ref: 9.10 104) Which of the following processes are endothermic? A) K⁺(g) + I⁻(g) KI(s) → B) 2 Br(g) Br2(g) → C) Ca(s) Ca(g) → D) 2 Na(s) + O2(g) Na2O(s) → E) None of the above are endothermic. Answer: C Diff: 2 Page Ref: 9.10 105) Which of the following processes are endothermic? A) the reaction associated with the lattice energy of LiCl. B) the reaction associated with the ionization energy of potassium. C) the reaction associated with the heat of formation of CaS. D) the formation of F2 from its elements in their standard states. E) None of the above are endothermic. Answer: B Diff: 2 Page Ref: 9.10 106) Use the bond energies provided to for the reaction below. estimate ΔH°rxn PCl3(g) + Cl2(g) PCl5(l) = ? → ΔH°rxn Bond Bond Energy (kJ/mol) Cl-Cl 243 P-Cl 331 A) -243 kJ B) -419 kJ C) -662 kJ D) -67 kJ E) -905 kJ Answer: B Diff: 3 Page Ref: 9.10
D) the formation of NaBr from its constituent elements in their standard state E) None of the above are exothermic Answer: D Diff: 2 Page Ref: 9.10 104) Which of the following processes are endothermic? A) K⁺(g) + I⁻(g) → KI(s) B) 2 Br(g) → Br2(g) C) Ca(s) → Ca(g) D) 2 Na(s) + O2(g) → Na2O(s) E) None of the above are endothermic. Answer: C Diff: 2 Page Ref: 9.10 105) Which of the following processes are endothermic? A) the reaction associated with the lattice energy of LiCl. B) the reaction associated with the ionization energy of potassium. C) the reaction associated with the heat of formation of CaS. D) the formation of F2 from its elements in their standard states. E) None of the above are endothermic. Answer: B Diff: 2 Page Ref: 9.10 106) Use the bond energies provided to estimate ΔH°rxn for the reaction below. PCl3(g) + Cl2(g) → PCl5(l) ΔH°rxn = ? Bond Bond Energy (kJ/mol) Cl-Cl 243 P-Cl 331 A) -243 kJ B) -419 kJ C) -662 kJ D) -67 kJ E) -905 kJ Answer: B Diff: 3 Page Ref: 9.10
Practice%20Problems%20for%20Chp9.docx