Which of the following has a standard enthalpy of formation value (ΔH°_f) of zero at 298 K? A) H₂O(g) B) O(g) C) H₂O(l) D) O₂(g) E) O₃(g)

Name: Which of the following has a standard enthalpy of formation value (ΔH° f ) of zero at 298 K? A) H 2 O(g) B) O(g) C) H 2 O(l) D) O 2 (g) E) O 3 (g)
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Question

Quizplus · Accepted Answer

The standard enthalpy of formation of an element in its most stable form at 298 K and 1 atm is zero. O₂(g) is the most stable form of oxygen under these conditions.

Which of the Following Has a Standard Enthalpy of Formation