6)
Electrolysis equation is:
Fe3+ + 3e- ------> Fe
1 mol of Fe requires 3 mol of electron
1 mol of electron = 96485 C
So,1 mol of Fe requires 289455 C
let us calculate the charge passed:
time, t = 3.01*10^2s
Q = I*t
= 2.74A * 3.01*10^2s
= 8.247*10^2 C
mol of Fe plated = 8.247*10^2/289455 = 2.849*10^-3 mol
Molar mass of Fe = 55.85 g/mol
mass of Fe = number of mol * molar mass
= 2.849*10^-3 * 55.85
= 0.159 g
This should be theoretical mass
But actual mass = 0.150 g
So,
efficiency = actual mass * 100 / theoretical mass
= 0.150 * 100 / 0.159
= 94.3 %
Answer: 94.3 %
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