How many faradays of electricity are involved when 5.0 l of o2 at stp is converted to h20 in acid solution?

2 O₂ + 4 H⁺ → 2 H₂O

So 5 L of O₂ = 5 L / 22.4 L per one mole = 0.22 mol O₂

Since the mole ratio is constant, you don't have to multiply because of that. However, O₂ is reduced to a - 2 oxidation number.

So 2 (0.22 mol) = 0.44 mol of electrons = 0.44 Faraday