20 poin tolong wajib pakai cara ya thanks

V (STP) = n x 22.4
15 = n x 22.4
n = 0.67 mol

n e⁻ = 2 x n F₂ = 1.34 mol

n = i . t / 96500
1.34 = 20 . t / 96500
t = 6465.5 s
t = 1.8 jam (A)