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larutan CuSO4
CuSO4 → Cu^2+ + SO4^2-
K (-) : Cu^2+ 2e → Cu
0,05
mol elektron = 2/1 × 0,05 = 0,1
A (+) : 2 H2O → 4H^+ + 4e + O2
0,1
mol O2 = 1/4 × 0,1 = 0,025
(n ÷ v) O2 = (n ÷ v) N2
(0,025 ÷ v O2) = ((7 ÷ 28) ÷ 5)
v O2 = 0,5 dm^3