What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hours, through molten magnesium chloride? [1 faraday = 96500C, Mg = 24]

Assessment: JAMB UTME - Chemistry - 2019 Subject: Chemistry

Question 1 Report

What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hours, through molten magnesium chloride?
[1 faraday = 96500C, Mg = 24]
Answer Details
Current (I) = 2A; Time (t) = 2 hours = 7200 secs
Q = It
= 2 x 7200 = 14400C
1 F = 96500C
x = 14400C
x =  14400 96500
= 0.15F
Mg 2 +  + 2e −   →  Mg
2F  →  24g
0.15F  →  x
2x = 24 x 0.15
x =  24 × 0.15 2
= 1.8g
Read lesson note on Chemical Kinetics And Equilibrium Systems (Ghana Only) (WAEC)
Read lesson note on Electrolysis (JAMB)
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