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For the equlibrium, 2H 2 O H 3 O + + OH – , the value of Δ G° at 298 K is approximately :

1. –80 kJ mol –1
2. 100 kJ mol –1
3. –100 kJ mol –1
4. 80 kJ mol –1

Correct answer: 80 kJ mol –1

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