Heats, free energies, and equilibrium constants of some reactions involving O2, H2, H2O, C, CO, CO2, and CH4

Abstract

Values are presented for the following thermodynamic properties: The heatcontent function, (HO -Ho 0) / T, the free-energy function, (FO -Ho 0) / T,lthe entropy, So, the heat content, HO-Hoo, and the heat capacity, C" 0, for O2 (gas) to 5,000 oK, Hz (gas) to 5,000 oK, H20 (gas) to 3,000 oK, N2 (gas) to 5,000 oK, C (solid, graphite) to 1,500 oK, C (solid, diamond) to 1,200 oK, CO (gas) to 5,000 oK, CO2 (gas) to 3,500 oK, and CH. (gas) to 1,500 oK; the standard entropy, So, for H 2 0 (liq) at

Production of Graphite Targets by Deposition from CO/H2for Precision Accelerator14C Measurements

“…The formation of CH4 (3) is generally more favored at lower temperatures (Wagman et al, 1945). Several other gas-phase reactions such as FischerTropsch type formations of organic compounds (Falbe, 1982) can also occur, but should not be significant at conditions important to this discussion.…”

Thermodynamics of some simple sulfur-containing molecules

“…Their data, when corrected for the atomic weight of sulfur, give for the selected value: S (c, rhombic) + 0 2 (g) = S02 (g) LlH;98.16 = -70.947 ± 0.050 kcal/mole. 3 The earlier combustion measurements at constant pressure of Thomsen [26], which yield LlH;98. 16 = -71.04 ± 0.50 kcal/mole, confirm this value.…”

“…The translational con tributioos to the free-energy function, (FO -H~) / T; the h eat-content function, (}fD -H~)/ T ; entropy, S o; and heat capacity, 0 : , were calculated for all the molecules, using the equations given by Wagman et al [3].…”

Survey of the Literature on the Carbon-Hydrogen System

“…These -t-rehdsmay be seen from Fig. 1, where the equilibrium constants calculated from spectroscopic data for the species of interest 8 have been plotted against temperature.…”