NS TEST 6, C/P Question 19

[morrisol]

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so i was going through the solution and it says that E=0 and that you use equation 2 frmo the passage. i dont understand why you use equation 2 when it says in the question stem that the reacton is under standard conditions and in passage it says that equation 2 is used under non-stanard conditions. also i dont get why and how i would know that E=0. can someone explain both things to me please