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 C(diamond) → C(graphite) with equations from the following list:
(1) C(dianond)+O2(g)⟶CO2(g)ΔH=−395.4kJ
(2) 2CO2(g)⟶2CO(g)+O2(g)ΔH=566.0kJ
(3) C(graphite)+O2(g)→CO2(g)ΔH=−393.5kJ
(4) 2CO(g)⟶C(graphite)+CO2(g)ΔH=−172.5kJ