Practice question
Question
In a fuel cell, the anode reaction produces 0.224 L of H₂O vapor at STP from H₂. How many coulombs are involved? (F = 96500 C/mol)
Explanation
Anode: H₂ + 2OH⁻ → 2H₂O + 2e⁻ . 1 mol H₂O (22.4 L as vapor) requires 2F. Moles = (0.224/22.4) = 0.01 mol , Charge = 0.01 × 2 × 96500 = 1930 C .
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