. | 26.1 | 29.1 | ... |
| (2) C (solid) + O_2 . . . | 94.3 | 97.3 | ... |
| (3) CO + O (2 - 1) . . . | ... | ... | 68.2 |
| (4) Conversion of solid carbon | | | |
| into gas (3 - 1) . . . | 42.1 | 39.1 | ... |
| (5) C (gas) + O (1 + 4) . . | ... | ... | 68.2 |
| (6) Conversion of amorphous | | | |
| carbon to diamond . . | ... | ... | 3.0 |
| (7) C_2 + H_2 . . . . | -58.1 | -52.1 | ... |
| (8) C_2H_2 + 2-1/2O_2 . . | ... | ... | 315.7 |
|________________________________|_________|___________|________|
W. G. Mixter has determined the heat of combustion of acetylene to be
312.9 calories at constant volume, and 313.8 at constant pressure. Using
Berthelot and Matignon's data given above for amorphous carbon, this
represents the heat of formation to be -50.2 (Mixter himself calculates
it as -51.4) calories. By causing compressed acetylene to dissociate
under the influence of an electric spark, Mixter measured its heat of
formation as -53.3 calories. His corresponding heats of combustion of
ethylene are 344.
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