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Problem: At 25 oC, ΔHo = 1.895 kJ and ΔSo = – 3.363 J/K for the transition  C (graphite) →  C (diamond) Based on their data a) Graphite is more stable than diamond below 290 oC and diamond is more stable than graphite above 290 oC.  b) Graphite cannot be converted to diamond at 1 atm pressure.  c) Diamond is more stable than graphite at all temperatures at 1 atm.  d) Diamond is more stable than graphite below 290 oC and graphite is more stable than diamond above 290 oC. 

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Problem Details

At 25 oC, ΔHo = 1.895 kJ and ΔSo = – 3.363 J/K for the transition 

C (graphite) →  C (diamond)

Based on their data

a) Graphite is more stable than diamond below 290 oC and diamond is more stable than graphite above 290 oC. 

b) Graphite cannot be converted to diamond at 1 atm pressure. 

c) Diamond is more stable than graphite at all temperatures at 1 atm. 

d) Diamond is more stable than graphite below 290 oC and graphite is more stable than diamond above 290 oC. 

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