17. Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25C, diamond changes to graphite so slowly that the enthalpy change of the process must be obtained indirectly. De- termine AHrxn for C(diamond) C(graphite) with equations from the following list: (1) C(diamond) + O2(g) CO2(g) AH = -395.4 kJ (2) 2002(g) 2CO(g) + O2(g) AH = 566.0 kJ (3) C(graphite) + O2(g) CO2(g) AH = -393.5 kJ (4) 200(g) C(graphite) + CO2(g) AH = -172.5 kJ