The standard state of carbon as a free element is graphite. C₆₀ is an allotropic form of carbon belonging to a class of structures known as fullerenes. $\Delta \mathrm{H}_{f}^{\circ}$ for C₆₀ should be

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The standard enthalpy of formation ($\Delta \mathrm{H}_{f}^{\circ}$) for an element in its standard state is zero. Since C₆₀ is not the standard state of carbon (graphite is), its $\Delta \mathrm{H}_{f}^{\circ}$ would be positive, indicating it is less stable than graphite.

The Standard State of Carbon as a Free Element Is ΔHf∘\Delta \mathrm{H}_{f}^{\circ}ΔHf∘​

The Standard State of Carbon as a Free Element Is $\Delta \mathrm{H}_{f}^{\circ}$