The chemical thermodynamic properties of alkanethiol (RSH where R is an alkyl group) isomer groups from CH4S to C4H10S in the ideal gas phase have been calculated from 298.15 to 1000 K from tables of Stull, Westrum, and Sinke. In the absence of literature data on all isomers of higher isomer groups, the properties of isomers of C5H12S to C8H18S have been estimated using Benson group values. Equilibrium mole fractions within isomer groups have been calculated for the ideal gas state from 298.15 to 1000 K. For isomer group properties, increments per carbon atom have been calculated to show the extent to which thermodynamic properties of higher isomer groups may be obtained by linear extrapolation. Values of CP, S°, ΔfH°, and ΔfG° are given for all species of alkanethiols from CH4S to C8H18S in SI units for a standard state pressure of 1 bar.

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