6.48 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. Using...

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Extracted text: 6.48 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. Using equations from the numbered list below, determine AH for C(diamond) C(graphite) CO2(8) AH = -395.4 kJ (1) C(diamond) + O2(8) (2) 2CO,(g) → 2C0(g) + O2(g) ΔΗ 566.0 kJ (3) C(graphite) + 0(g) (4) 2CO(g) CO2(g) AH = -393.5 kJ C(graphite) + CO,(g) AH = -172.5 kJ