High yields of carbon disulfide can be obtained by the reaction of methane with sulfur at 700°C. and below when the reaction is carried out in the presence of a suitable cata-

Standard free energies of formation have been calculated for seventy-seven hydrocarbons and eight inorganic compounds in the gaseous state at 100°intervals from 298.1°to 1200°K. The tables include values for the normal paraffins (methane to n-decane), the 1-olefins (ethylene to 1decane), various branched-chained saturates and unsaturates of four to eight carbon atoms, and the inorganic compounds carbon monoxide, carbon dioxide, water, ammonia, carbon disulfide, hydrogen sulfide, sulfur dioxide, and sulfur trioxide. Distinctionis made between the more accurate values for straight-chain hydrocarbons and those for their branched-chain isomers.IN 1937 Thomas, Egloff, and Morrell (SI) published tables giving the standard free energies of formation of a large number of gaseous hydrocarbons at 298.1°, 500°, and 1000°K. Since that time more accurate data have been presented by Rossini, Pitzer, and others on heats of formation and entropies of a greater variety of hydrocarbons than were available to Thomas et al. This more recent work has been sufficiently extensive in scope to permit us to obtain, in the absence of direct determinations, reasonably accurate values of thermodynamic functions from the trends shown by the known values of compounds possessing one or more similar characteristics in structure.Using the more exact data now available, we have calculated the free energies of a number of gaseous paraffins and olefins. In addition, tables are included containing free energy values for a number of gaseous inorganic compounds that are of interest to petroleum chemists, either because of their own low cost which might permit their use as reactants or of the low cost of the raw material required to react with hydrocarbons to produce these substances as by-products of a more desired primary reaction.

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