The enthalpy of formation 0 something with standard states


How do I go about figuring out if the enthalpy of formation = 0? Something with standard states? But how do I know what the standard states are?

ex: Which has an enthalpy formation equal to 0?

H2SO4 (aq)
Ne (g)
H2 (g)
O3 (g)

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Chemistry: The enthalpy of formation 0 something with standard states
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