Question 1
If an electrolysis plant operates its electrolytic cells at a total current of 1.2 × 106 amp, how long will it take to produce one metric ton (one million grams) of Mg(s) from seawater containing Mg2+? (1 faraday = 96,485 coulombs)
◦
1.8 h◦
1.8 days◦
55 min◦
0.92 h◦
0.46 yearQuestion 2
In order to determine the identity of a particular lanthanide metal (M), a voltaic cell is constructed at 25°C with the anode consisting of the lanthanide metal as the electrode immersed in a solution of 0.0594 M MCl3, and the cathode consisting of a copper electrode immersed in a 1.00 M Cu(NO3)2 solution. The two half-reactions are as follows:
M(s) → M3+(aq) + 3e–
Cu2+(aq) + 2e–→ Cu(s)
The potential measured across the cell is 2.64 V. What is the identity of the metal?
Reduction Half-Reaction | E° (V) |
Cu2+(aq) + 2e–→ Cu(s) | 0.34 |
Ce3+(aq) + 3e–→ Ce(s) | –2.336 |
Dy3+(aq) + 3e–→ Dy(s) | –2.295 |
Eu3+(aq) + 3e–→ Eu(s) | –1.991 |
Gd3+(aq) + 3e–→ Gd(s) | –2.279 |
Sm3+(aq) + 3e–→ Sm(s) | –2.304 |
◦
Ce◦
Eu◦
Dy◦
Gd◦
Sm
plant cell
Plant Cell
Each cell nucleus throughout the body contains the genes, DNA, and chromosomes that make up the ...
What is the identity of this atom?
RFLP diagnosis of sickle-cell anemia
Illustration of the cell membrane