Please tell me concept and details. Not hurry but I need the right answer. If or

Question

Please tell me concept and details.
Not hurry but I need the right answer.
If organic chemistry , I want the mechnism too. Thanks.

k2 C+B D find-dC/dt,-dColdt, and dCydt in terms of CA, G, and Co. (20%) 4, (a) Calculate the standard potential for the reaction Pb (s) + 2Ag-2Ag(s)tpb2. given that the standard oxidation potential forthe reaction Pb = Pb, 2e is 0.13 V and that for Ag-Ag+ + e. is-0.80 V. (10%) (b) The half reaction Fe = Fe2+ + 2e has an oxidation potential of 044 V and the half reaction Fe2+-Fe3+ + e has an oxidation potential of-0.77 V. Calculate the oxidation potential for the standard half cell Fe-Fe3+ + 3e. (10%) 0 D2 5. A 10-kg steel casting (Cp-0.5 kJ kg-K'l) at a temperature of 500 is quenched in 100 kg of oil (C,-2.5 kl kg"K") at 25 °C. If there are no heat losses, what is the change in entropy of (a) the casting, (b) the oil, and (e) both considered together? (20%)

Explanation / Answer

The standard reduction potential is in a category known as the standard cell potentials or standard electrode potentials. The standard cell potential is the potential difference between the cathode and anode. For more information view Cell Potential. The standard potentials are all measured at 298 K, 1 atm, and with 1 M solutions.

Write balanced half-reactions and the overall spontaneous reaction, without using a table of half-cell potentials. Since the silver electrode is positive, that means it is the cathode in this voltaic cell, and so Ag+ is reduced, thus the reactions must be

2Ag+ (aq) + 2 e- = = > 2 Ag (s) 0

Pb (s) ==> Pb+2 (aq) + 2e-

********************************

2Ag+ (aq) + Pb (s) Pb+2 (aq) + 2 Ag (s)

Ecell = Ecathode - Eanode = 0.13 V – (- 0.83 V)

= 0.96 V

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