Question

diamond and graphite are two crystalline forms of carbon. At 1 atmand 25 degrees C, diamong chages to graphite so slowly that theenthalpy change of the process must be obtained indirectly.Determined delta h reaction for
C(diamond)--> C(graphite)

1) C(diamond) + 02 (g) --> CO2 (g) delta H = -395.4
2) 2 CO2 (g) --> 2CO (g) + 02 (g) delta H = 566.0
3) C(graphite) + 02 (g)--> CO2 (g) delta H = -393.5
4) 2 CO (g) ---> C(graphite) + CO2 (g) delta H = -172.5