SOLVED

31) Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) Sn(s) + 2 Ag?(aq) → Sn2+(aq) + 2 Ag(s) Sn2+(aq) + 2 e? → Sn(s) E° = -0.14 V Ag?(aq) + e? → Ag(s) E° = +0.80 V A) +1.74 V B) +0.94 V C) +1.08 V D) -1.08 V E) -1.74 V 32) Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq) Mg2+(aq) + 2 e? → Mg(s) E° = -2.38 V Cu2+(aq) + 2 e? → Cu(s) E° = +0.34 V A) +2.04 V B) -2.04 V C) +2.72 V D) -1.36 V E) +1.36 V 33) Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) 2 K(s) + I2(s) → 2 K?(aq) + 2 I?(aq) K+(aq) + e? → K(s) E° = -2.93 V I2(s) + 2 e? → 2 I?(aq) E° = +0.54 V A) +6.40 V B) +1.85 V C) -5.32 V D) +3.47 V E) +5.32 V 34) Identify the characteristics of a spontaneous reaction. A) ΔG° < 0 B) ΔE°cell > 0 C) K > 1 D) all of the above E) none of the above 35) How many electrons are transferred in the following reaction? (The reaction is unbalanced.) I2(s) + Fe(s) → Fe3+(aq) + I?(aq) A) 1 B) 2 C) 6 D) 3 E) 4 36) Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb2+(aq) + Cu(s) → Pb(s) + Cu2+(aq) A) -41 kJ B) -0.47 kJ C) +46 kJ D) +91 kJ E) -21 kJ 37) Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. 3 I2(s) + 2 Fe(s) → 2 Fe3+(aq) + 6 I?(aq) A) -1.1 × 102 kJ B) +4.9 × 101 kJ C) -9.7 × 101 kJ D) +2.3 × 102 kJ E) -3.3 × 102 kJ 38) Use the tabulated half-cell potentials to calculate ΔG° for the following redox reaction. 2 Al(s) + 3 Mg2+(aq) → 2 Al3+(aq) + 3 Mg(s) A) +4.1 × 102 kJ B) +1.4 × 102 kJ C) -2.3 × 102 kJ D) -7.8 × 102 kJ E) +6.8 × 102 kJ 39) Use the tabulated half-cell potentials to calculate ΔG° for the following redox reaction. 2 Ag(s) + Pb2+(aq) → Ag+(aq) + Pb(s) A) 179 kJ B) 89.5 kJ C) -328 kJ D) -107 kJ E) 212 kJ 40) Which of the following reactions would be the most spontaneous at 298 K? A) A + 2 B → C; E°cell = +0.98 V B) A + B → 2 C; E°cell = -0.030 V C) A + B → 3 C; E°cell = +0.15 V D) A + B → C; E°cell = +1.22 V E