Use the following data to determine the Delta H for the conversion of diamond into graphite:
Cdiamond (s) + O2 (g) → CO2 (g) ΔH° = -395.4 kJ
2CO2 (g) → 2CO (g) + O2 (g) ΔH° = 566.0 kJ
2CO (g) → Cgraphite (s) + CO2 (g) ΔH° = -172.5 kJ
Cdiamond (s) → Cgraphite (s) ΔH° = ?