The answer is 0.568 A.
The mathematical equation depicting the relationship of a charge and current is
Q = It
(1 faraday = 96500 C)
Here,
I - - > current
t - - > time
Standard value of atomic mass of nickel is 58.69 g/mol.
Using the moles formula,
n = m/M
where n is number of moles
m is mass of substance and
M is the atomic mass.
Putting the values,
n = 2.8/ 58.69
n = 0.04770 mol
Now the charge on the Nickel ion is 2 hence
Q = 2 x 0.04770 F
= 0.0954 x (96500C/1F)
= 9206.1 C
Now, Q = It
Putting the values
9206.1 C = I x 4.5 hours
Now 4.5 hours = 16,200 seconds.
I = (9206.1)/(16200)
I = 0.56827 C/s or 0.56827 A
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