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Question

In a fuel cell H2 and O2 react to product electricity. In the process, hydrogen is oxidized at anode and oxygen at cathode. If 67.2 l of H2 at STP reacts in 15 min, the average current produced (inA) is_______. (nearest value)

Anode : H2+2OH2H2O+2e
Cathode : O2+2H2)+2e4OH

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Solution

Anode : H2+2OH2H2O+2e

Volume of H2 reacts in 15 min = 67.2 L

Moles of H2=67.222.4=3mol

2 F =1molH2

3 mol H2=6F

I×15×6096500=6

I=643.33A643 A

Cu2++2eCu

2 F = 1 mol Cu
6 F = 3 mol Cu

Grams of Cu deposite =3×63.5=190.5g

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