13. How many electrons are transferred in the following reaction? (The reaction

Question

13. How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Fe2+ (aq) + K(s) Fe(s) + K+(aq) A) 1 6 14. Use the tabulated half-cell potentials below to calculate G° for the following balanced redox reaction. Pb2+(aq) + Cu(s) Pb(s) +Cu2+(aq) Pb2+(aq) + 2 e- Pr(s) Cu2+(aq) + 2e - Cuds) A)-41 k 15. Use the tabulated half-cell potentials below to calculate AG for the following balanced redox reaction. B)-047 k C)46 kJ D)91k E)-21 kJ 312(s) + 2 Fe(s) 2 Fe3+(al) + 61-(aq) E"= 054 V 12(s) + 2 e- 2-(aq) Fe3+(aq) + 3e- Fe(s) E"=-0.036 V A)-1.1 x 102 k) B)4.9 x 101 k C-3.3 x 102 kJ D)23 x 102k E)-97x101 kJ 16. Give the type of battery that most cars contain. A) lead-acid battery D) nickel-cadmium battery E) nickel-metal hydride battery B) dry-cell battery Calkaline battery 17. What mass of aluminum can be plated onto an object in 755 minutes at 5.80 A of current? A) 73.5 g B) 24.5g C)220.G D)147gE)8.17g 18. Nickel can be plated from aqueous solution according to the following half reaction. How long would it take (in minutes) to plate 29.6 g of nickel at 4.7 A? Ni2+(aq) +2e Ni(s) A) 1.7 x 102 minutes D) 4.8 × 102 minutes B) 59% 102 minutes E) 6.2 x 102 minutes C)3.5 x 102 minutes

Explanation / Answer

13. B (2 electrons are involved in the reaction)

14. D

    Ecell = -0.47 V ;

    G = -nFE

   2 * 96485 x 0.47V =91.7 kJ

15. C

Ecell = 0.576 V ;

    G = -nFE

   6 * 96485 x 0.576V =-3.3x102 kJ

16. A (lead-acid battery is used)

17. B

w = ZIt

z=9.36 x10-8 kg/C, I =5.80 A, t = 755 x 60 = 45300 s

w = 9.36 x10-8 kg/C x 5.80 A x 45300 s

w = 24.5g

18. C

w = ZIt

z=3.040 x10-7 kg/C, I =4.7 A, t = ?

w = 29.6 g

29.6 g = 3.040 x10-4 g/C x 4.7 A x t

t= 345.27 min

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