Calculate the mass in kilograms of magnesium pr... - JAMB Chemistry 1992 Question
Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.
A
2.7
B
5.4
C
10.8
D
21.7
correct option: b
Mg + 2e → 24 gms
2f → 24 gms<br />
2 x 96,500 → 24 gms
Q = (500 x 1440 x 60)
Q = 4320000 C
1 mole of mg = (1) / (2 x 96,500) x (43200000) / (1)
= (24)/(1) = (1036800000) / (193000) = 5372.020725 gms
in leg = (5372.020725) / (1000) = 5.4 leg
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