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Ozone, O3(g), is a form of elemental oxygen produced during electrical discharge. Is ΔH∘f for O3(g) necessarily zero? Yes or no question?

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Answer: ΔH°f is not zero

Step-by-step explanation:

the change in enthalpy formation is zero when elements are pure.when they are zero it is mainly because they are most basic,where you cannot form an element with an element.

User Cycododge
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The answer for your question is No. This is because in given conditions, it is not the most stable form of oxygen's element. It will not equate into zero because there will be charge remained after balancing the equation.
User BenMills
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