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n O₂ = V O₂ / 22.4 = 0.14 / 22.4 = 0.00625 mol
n e⁻ = 4 x n O₂ = 4 x 0.00625 = 0.025 mol
n e⁻ = i . t / 96500
0.025 = 1.25 . t / 96500
t = 1930 s