Answer Happy

2+ Electrochemistry Cell Potential Problems 1. Which of the following is the correct cell 3. Given the two half reactions and their potentials, notation for the reaction which net reaction is spontaneous? Hg22+ + Cd(s) → Cd2+ + 2Hg(1) Ni2+(aq) + 2e → Ni(s) E° = -0.25 V a) Cd2+ Cd || Hg22+ | Hg Mg2+(aq) + 2e → Mg(s) E° = -2.37 V b) Cd2+ | Hg22+ || Cd | Hg a) Ni(s) + Mg2+(aq) Mg(s) + Ni2+(aq) c) Cd Cd2+ || Hg22+ Hg b) Ni2+(aq) + Mg(s) + Mg2+(aq) + Ni(s) d) Cd2+ | HgHg22+ Cd c) Ni(s) + Mg(s) + Mg2+(aq) + Ni2+(aq) e) Hg Cd ||Hg22+ Cd2+ d) Mg2+(aq) + Ni2+(aq) + Mg(s) + Ni(s) e) Mg2+(aq) + Mg(s) → Ni(s) + Ni2+(aq) 2. Consider an electrochemical cell where the following reaction takes place: 4. Calculate Eº for the following reaction: 3Sn2+(aq) + 2Al(s) + 3Sn(s) + 2A13+(aq) Sn++(aq) + 2K(3) Sn2-(aq) + 2K+(aq) Which of the following is the correct cell a) +6.00 V d) +2.78 V notation for this cell? b) -3.08 V e) -2.78 V a) Al A13+|| Sn2+ | Sn c) +3.08 V b) A13+ A1 || Sn Sn2+ c) Sn Sn2+|| A13+ | Al 5. Calculate Eº for the following reaction: d) Sn | A13+ || Al | Sn2+ 2A13+(aq) + 3Cd(s) → 2Al(s) + 3Cd2+(aq) e) Al | Sn2+ || Sn | A13+ a) -2.06 V d) -4.52 V b) +4.52 V e) -1.26 V c) +2.06 V