Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite so slowly that the enthalpy change of the process must be obtained indirectly. Determine Hrxn for (diamond) (graphite) with equations from the following list: (1) C(diamond) + O2(g) â CO2(g) (2) 2 CO2(g) â 2 CO(g) + O2(g) (3) C(graphite) + O2(g) â CO2(g) (4) 2 CO(g) â C(graphite) + CO2(g) AH=-395.4 kJ AH = 566.0 kJ AH =-393.5 kJ AH =-172.5 kJ AHoverall- k/