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A current of 0.536 A is passed through acidified water for 30 minutes. What volume of hydrogen gas, measured at STP, is liberated?

1. 0.1135 litre
2. 0.227 litre
3. 0.057 litre
4. 0.454 litre

Correct answer: 0.1135 litre

Solution

Faraday's laws give moles of electrons; halving gives moles of H2; multiply by 22400 mL for STP volume.

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