Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite Нехn for slowly that the enthalpy change of the process must be obtained indirectly. Determine A So rxn C(diamond)Cgraphite) with equations from the following list: (1) С(diamond) + O,g) (2) 2 CO2(g) CO2(g) 2 CO(g)02(g) ДН %—D —395.4 kJ = AH 566.0 k.J + (3) C(graphite)+02(s) -»CO2(g) (4) 2 CO(g)C(graphite)+CO2(g) ДН %3D —393.5 kJ AH=-172.5 kJ ДНov kJ overall

Question
Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to
graphite
Нехn for
slowly that the enthalpy change of the process must be obtained indirectly. Determine A
So
rxn
C(diamond)Cgraphite)
with equations from the following list:
(1) С(diamond) + O,g)
(2) 2 CO2(g)
CO2(g)
2 CO(g)02(g)
ДН %—D —395.4 kJ
=
AH 566.0 k.J
+
(3) C(graphite)+02(s) -»CO2(g)
(4) 2 CO(g)C(graphite)+CO2(g)
ДН %3D —393.5 kJ
AH=-172.5 kJ
ДНov
kJ
overall

Image Transcription

Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite Нехn for slowly that the enthalpy change of the process must be obtained indirectly. Determine A So rxn C(diamond)Cgraphite) with equations from the following list: (1) С(diamond) + O,g) (2) 2 CO2(g) CO2(g) 2 CO(g)02(g) ДН %—D —395.4 kJ = AH 566.0 k.J + (3) C(graphite)+02(s) -»CO2(g) (4) 2 CO(g)C(graphite)+CO2(g) ДН %3D —393.5 kJ AH=-172.5 kJ ДНov kJ overall

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