Grade 12Physical Chemistry
Ifa current of 500A is used, how many hours will be required to convert all the 1000kg of MgCl2 into Mg metal
1 Answer
Chhavi Jain
Dear student ,
we can say that , moles of MgCl2 = (1000 * 1000 ) / 94 = moles of Mg2+ = 10638.2 moles
Now, Mg2+ + 2e- -------> Mg
To convert 1 mole Mg ions ------> 2 F charge is required ( or 2 mole electrons )
So, to convert 10638.2 moles of Mg ions ----> 2 F * 10638.2 charge is required
= 2 * 96500 * 10638.2 C
Now, use the formula Q= It to find the time :
Q : charge
I : current
t : time
2 * 96500 * 10638.2 = 500 * t
t = 4106345.2 sec or 1140 hrs ( approx)
Chemistry Consultant
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