The standard Gibbs free energy change, ΔG°298, for the conversion of Cdiamond into Cgraphite has an approximate value of –3 kJ mol−1. However, graphite does not form from diamond under standard conditions (298 K and 1 atm). Which of the following best explains this observation?

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The standard Gibbs free energy change, ΔG°298, for the conversion of Cdiamond into Cgraphite has an approximate value of –3 kJ mol−1. However, graphite does not form from diamond under standard conditions (298 K and 1 atm). Which of the following best explains this observation?