Energy of the Hg—C Bond and The Heat of Atomization of Carbon


    IT has not yet been possible to make a final choice, from spectroscopic and vapour pressure data, between the two alternative values of 124·3 and 170·6 kilocalories/gram atom for the heat of atomization of carbon (ΔH291°K. for the change Cdiamond → Cgas)1, though the most recent treatment favours the higher value2, and this also makes easier the correlation of some kinetic and thermochemical data3.

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    1. 1

      See Skinner, H. A., Trans. Faraday Soc., 41 (1945, in the press). The two values for the & Delta;H291°K for the diamond atomization are derived from the two alternative values for DZ(CO) to 9.10 eV. and 11.11 eV. The fact that the use of the new conversion factors now raises the lower value of DZ(CO) to 9.14 eV. does not affect the treatment given here.

    2. 2

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      Pauling, L., œNature of the Chemical Bond (Ithaca 2nd Ed., 1940), 54.

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      Bichowsky, F. R., and Rossini, F. D., œThermochemistry of Chemical Substances (New York, 1936), 69.

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      Pauling, op. cit., 53.

    8. 8

      Pauling, op. cit, 131.

    9. 9

      Pauling, op. cit., 136.

    10. 10

      Latent heat of fusion for the diphenyl from melting point by Walden's rule (Z. Elektrochem., 14, 715; 1908). Latent heats of evaporation (at 25°) by assuming a Trouton constant of 21.

    11. 11

      Horn, E., Polanyi, M., and Sattler, H., Z. phys. Chem., B, 17, 220 (1932). Wieland, K., Z. phys. Qhem., B, 42, 422 (1939). Butler, E. T., and Polanyi, M., Trans. Faraday Soc, 39, 19 (1943).

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      Pauling, ref. 7; but see Skinner, ref. 1.

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    Energy of the Hg—C Bond and The Heat of Atomization of Carbon. Nature 156, 599–600 (1945).

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