2. For each of the following pairs of half-cells: a. Write a balanced chemical equation for each half-reaction and the overall reaction. b. Determine Eºcell for the reaction. c. Is the cell spontaneous as written? d. Calculate AGO xn for the cell reaction. Anode: Cathode: Al(s) → Alt³(aq) I₂(aq) → I¹(aq) Ered=-0.1238V Ered=+0.5273V

AG° = - â F E° ćel! n FE Consider the following reaction: 3 Pb2+ + 2 Cr(s) → 3 Pb(s) + 2 Cr3+ Using the values in Table 17.2, calculate Eell for this reaction. How many electrons are transferred in this reaction? n = Calculate AG° for this reaction. Is the reaction spontaneous under standard conditions? Justify your answer. Cell Potential and Keg We can also relate Ecell to Keq by the following equation: Ecell = RT nF %3D Consider the oxidation of zinc metal by acid (H*) under standard conditions (25°C). Write a balanced equation for this reaction. Using the values in Table 17.2, calculate Eell for this reaction. How many electrons are transferred in this reaction? n = Calculate Keg for this reaction.

3. Calculate the free energy, AG°, for each electrochemical cell given the following information and determine if the reaction is spontaneous or nonspontaneous. T= 298 K a. E cell =+ 2.10 V, n= 2 b. Каg— 2.2 х 10-3 c. E cell =- 0.677 V, n = 3 =

Cell Potential For a given galvanic cell, the standard cell potential can be calculated by subtracting the standard half-cell potential of the reaction that occurs at the cathode from the standard half-cell potential of the reaction that occurs at the anode: Ecell Ered (cathode) - Ed (anode) ▼ Tarnish on copper is the compound CuO. A tarnished copper plate i placed in an aluminum pan of boiling water. When enough salt is added so that the solution conducts electricity, the tarnish disappears. Imagine that the two halves of this redox reaction were separated and connected with a wire and a salt bridge. Part A Calculate the standard cell potential given the following standard reduction potentials: A²+ +3e Cu²+ + 20 Express your answer to two decimal places and include the appropriate units. ▸ View Available Hint(s) Ecell = li Value 4 → Units ? Al; E Cu; E 19 of 42 -1.66 V 0.340 V Review | Constants | Periodic Table

11. The following two half-cells are connected to form a full Galvanic cell: Cu"(aq) +2e Au (aq) +e → Cu(s) → Au(s) E° = 0.34 V E 1.69 V a. Calculate E° for the cell. b. Give the cell notation for this system. c. Give the balanced cell reaction. d. Calculate AG for the reaction e. Calculate Keg for the reaction. £. Calculate the cell potential if the activity of Cu is 0.0100 and the activity of Au" is 1.340.

As with any voltaic cell, the potential of zinc-copper cell changes during cell operation because the concentrations of the components do.If E°cell = + 2.71 V, [Mg2+] = 1.0 x 10-4 M and [Cu2+] = 2.0 M; find Ecell.Is the reaction at equilibrium?

A charger that supplies a current of 120. mA of current is used to recharge a NiCd battery. How much time, in h, does it take to convert 1.55g of Cd(OH)2 back into Cd so the battery can be used again? O4.73 O 1.25 O 2.29 3.94 O0.732