... smellMolecular weight: 110.96 Vapor pressure 0.13kPa (157 c) Melting point: 340 ~ 350 c Solubility: Insoluble in water, ethanol, acetone, benzene ... extremely apt for evaporation; sublimation temperature is 315 S , the melting point is 340-350. It would easily turns into selenious acid ...