A number of gaseous oxyacid salts have been identified by Knudsen effusion mass spectrometry, while vaporizing Cr₂O₃ and mixtures of Cr₂O₃+Nb₂O₅, Cr₂O ₃+Ta₂O₅, Cr₂O₃+BaO, and Cr₂O₃+ Mg₂P₂O₇ from molybdenum and tungsten cells. The stabilities of the gaseous molecules CrMoO₃, CrMoO₄, CrMoO₅, CrWO₃, CrWO₄, CrWO₅, CrNbO₃, CrTaO₃, CrPO₂, CrPO₃, BaCrO₂ and BaCrO₃ were deduced from the measurements. The thermodynamic properties of this gaseous chromium-containing species are summarized. Prediction is tentatively made of the stability of as-yet unstudied gaseous molecules.