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

question 4

Multiple Choice

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

• A) zero
• B) positive
• C) negative
• D) equal to \(\Delta \mathrm{H}_{f}^{\circ}\)
• for the other allotropic forms of carbon
• E) A and D

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