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The weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be:

1. 5.4 g
2. 10.8 g
3. 54.9 g
4. 108.0 g

Correct answer: 54.9 g

Solution

The volume of O2 at STP is 5600 mL, which corresponds to 0.25 moles (using 1 mole = 22400 mL at STP). Since 4 moles of electrons are required to produce 1 mole of O2, 1 mole of O2 corresponds to 4 Faradays. For 0.25 moles of O2, 1 Faraday is used. 1 Faraday deposits 108 g of silver (1 equivalent weight). Thus, the weight of silver deposited is 108 × 1 = 54.9 g.

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