Answer to Question #294156 in General Chemistry for Topher

Question

Directions. Solve the following problems. Show your solutions.

I. For the voltaic cell, 2 Na(s) + Fe2+(aq) → 2 Na+

(aq) + Fe(s)

a) Write the two half-reactions.

b) Write the cell notation.

c) Calculate E ° for the cell.

II. Consider the fission reaction 1

0n + 235

92U →

89

37Rb + 3 0

-1e + 3 1

0n + 144

58Ce

How much energy in kilojoules is released per gram of Uranium- 235?

III. For Al-28, calculate the binding energy in kilojoules /mol?

IV. Sketch a portion of the acrylonitrile polymer ( Refer to Table 23.1) assuming it is a

a) head-to-tail polymer

b) head-to-tail, tail-to-tail polymer

Answer 1

To determine the E? value of a cell, we determine the anode and cathode half cell reactions and then calculate the E? by the help of the formula:

E ? ( cell ) = E? (cathode) - E? (anode)

The half-cell reactions are written as below:

Anode: Na(s) → Na+ (aq) + e- E? (anode) = -2.714V

Cathode: Fe2+ (aq) + 2e- → Fe(s) E? (cathode) = -0.409V

So, E? (cell) = -0.409 – (-2.714) = 2.305V