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2H+(aq) + 2e- -> H2(g). Calculate PH2 for [H+]^2 = 10^-14 atm.

1. PH2 = 10^-14 atm
2. PH2 = 1 atm
3. PH2 = (10^-7)^2 atm
4. None of the above

Correct answer: PH2 = (10^-7)^2 atm

Solution

The given reaction relates the concentration of H+ ions to the partial pressure of H2 gas. Since [H+]^2 = 10^-14 atm, PH2 = (10^-7)^2 atm, which matches the given condition.

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