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Knudsen effusion studies of the decomposition of Sn2S3(s) have been performed employing mass spectrometry in the temperature range 669‐763 K and vacuum microbalance techniques in the range 677 ‐ 820 K yielding pressures from about 10−2 to 10 Pa. The results demonstrate that Sn2S3(s) decomposes under present experimental conditions according to the reaction Sn2S3(s) = 2SnS(s) + 1/2 S2(g). The mean values for the third‐law heat and second‐law entropy of reaction based on direct mass‐loss data are ΔH°298 = 114.0 ± 3.0 kJ/mol and ΔS°298 = 97.3 ± 3.5 J/ K · mol. From these data the standard heat of formation and absolute entropy of Sn2S3(s) are calculated to be −254.5 ± 6.0kJ/mol and 170.5 ± 6.0 J/K · mol, respectively.

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