Reference Label | Details |
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Hawtin 1966 | P. Hawtin, J. B. Lewis, N. Moul, and R. H. Phillips, Phil. Trans. Roy. Soc. A 261, 67-95 (1966) The Heats of Combustion of Graphite, Diamond and Some Non-Graphitic Carbons |

note CO2e | Hawtin 1966 perform their own measurements of the enthalpy of combustion of graphite and also analyze all literature data. From this they derive the 298 K "best" value of 94042.8 +- 5.8 cal/mol = 393475.1 +- 24.3 J/mol as a weighted average of all groups of measurements except Prosen 1944 (which they find "significantly" higher than the others), and, for comparison, a value of 94039.7 +- 9.8 cal/mol = 393462.1 +- 41.0 J/mol as a weighted average for spectroscopically pure graphite. The weighted average of their own measurements (in cal/mol, Ticonderoga 94028 +- 17.5; AGKSP 94039 +- 11.9; PGA 94053.4 +- 13.1) is 94042.0 +- 28.9 cal/mol = 393471.6 +- 121.1 J/mol. Note that this uncertainty is 4.3 times std. dev. Taking into account the number of actual samples, a value of 2 times std. dev., 13.4 cal/mol = 56.3 J/mol could be derived. They also obtain for the combustion of diamond the enthalpy at 298 K of 94477.4 +- 29.5 cal/mol = 395293.4 +- 123.4 J/mol. Their "best" for diamond, 94490.1 +- 16.7 cal/mol = 395346.6 +- 69.9 J/mol, takes into account previous data by Jessup 1938. From their "best" values they obtain also for C |