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517Therefore the neglect of the effect of pressure on the fugacity function of the reduced pressure for constant reduced temperaof normal pentane would in this case introduce an error of tures. about 18 per cent. Since these conditions of temperature and pressure are frequently encountered in the absorption of natural gasoline, it is necessary to consider the effect of (1) Gibbs, J. IT., Trans. Conn. Acad., 3, 108-248 (1876) pressure on the fugacity of liquid hydrocarbons. These calcu-(2) G.Am.373 49 (1901). (3) Lewis and Randall, "Thermodynamics," McGraw-Hill, 1923. lations have been made and are presented in Figure 2, in (4) poynting, J , H., PhLl. dvag,, [SI 12, 32 (1881). which the fugacity of the liquid hydrocarbons is plotted as a (5) Tunnell, J . P h y s .

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Systematic correlation methods for the prediction of heat capacities and heat contents of hydrocarbons in the ideal vapor state have been developed on the basis of molecular structure.Values for the several structural groups necessary to the correlation method are tabulated for temperatures from -250°to 3000°F. Extensive tabulations of heat capacities and heat contents for many hydrocarhons in the ideal vapor state as calculated by this correlation are presented for temperatures from -250°to 3000 °F. Similar tabulations of the latest values for common gases are included for ready reference. Differences INDUSTRIAL AND ENGINEERING CHEMISTRY

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