Question: Pencil lead is almost pure graphite. Graphite is the stable elemental form of carbon at 25C and 1 atm. Diamond is an allotrope of graphite.

Pencil “lead” is almost pure graphite. Graphite is the stable elemental form of carbon at 25°C and 1 atm. Diamond is an allotrope of graphite. Given:

diamond: ΔHf° = 1.9 kJ/mol; S° = 2.4 J/mol • K  at what temperature are the two forms in equilibrium at 1 atm? 

C (graphite) <—> C (diamond)

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