2. Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite so slowly the enthalpy change of the process must be obtained indirectly. Determine AHxn for C(diamond) → C(graphite) using the following information. NOTE: Not all of the formulas are needed. C(diamond) → C(graphite) AHan = ? 1. C(diamond) + Oz(g) → CO2(g) 2. 2 CO2(g) → 2CO(g) + O2(g) 3. C(graphite) + Oz(g) → CO2(g) 4. 2 CO(g) → C(graphite) + CO2(g) AH = -395.3 kJ AH = 566.0 kJ AH = -393.5 kJ AH = -172.5 kJ

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