What mass of magnesium would be obtained by pas... - JAMB Chemistry 2019 Question
What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hours 30 mins, through molten magnesium chloride?
[1 faraday = 96500C, Mg = 24]
A
1.12g
B
4.48g
C
1.80g
D
2.00g
correct option: c
Given:
Current (I) = 2A; Time (t) = 2 hours = 7200 secs
Q = It
= 2 x 7200 = 14400C
1 F = 96500C
x = 14400C
x = \(\frac{14400}{96500}\)
= 0.15F
Mg\(^{2+}\) + 2e\(^-\) \(\to\) Mg
2F \(\to\) 24g
0.15F \(\to\) x
2x = 24 x 0.15
x = \(\frac{24 \times 0.15}{2}\)
= 1.8g
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