For which should the standard heat of formation Δ H° f, be zero at 25°C?
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O2(g) |
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O(g) |
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NaI(s) |
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CBr4 |

Oxigen gas is naturally occurring stable gas. So (O2) form is highly stable.
For which should the standard heat of formation Δ H° f, be zero at 25°C? O2(g)...