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When an electric current is passed through acidified water, 112 mL of hydrogen gas is obtained at the cathode at STP in 965 s. What is the current, in amperes?

1. 1.0
2. 0.5
3. 0.1
4. 2.0

Correct answer: 1.0

Solution

112 mL H2 at STP = 0.112/22.4 = 0.005 mol, needing 2 x 0.005 = 0.01 mol electrons = 965 C. I = Q/t = 965/965 = 1.0 A.

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