Three of the forms of elemental carbon are graphite, diamond, and buckminsterfullerene. The entropies at 298 K for graphite and diamond are listed in Appendix C. (a) Account for the difference in the S° values of graphite and diamond in light of their structures (Figure 12.29, p. 503). (b) What would you expect for the S° value of buckminsterfullerene (Figure 12.47, p. 516) relative to the values for graphite and diamond? Explain.
Three of the forms of elemental carbon are graphite, diamond, and buckminsterfullerene. The entropies at 298 K for graphite and diamond are listed in Appendix C. (a) Account for the difference in the S° values of graphite and diamond in light of their structures (Figure 12.29, p. 503). (b) What would you expect for the S° value of buckminsterfullerene (Figure 12.47, p. 516) relative to the values for graphite and diamond? Explain.
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Related questions
Elemental carbon usually exists in one of two forms: graphite or diamond. It is generally believed that diamonds last forever. The table shows the standard enthalpy of formation (?H?f) and the standard molar entropy (S?) values for diamond and graphite.
| Substance | ?H?f (kJ/mol) | S? (J/mol?K) |
| Cgraphite | 0 | 5.740 |
| Cdiamond | 1.897 | 2.38 |
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K?
Cdiamond?Cgraphite
Express your answer to three significant figures and include the appropriate units.
