Tungsten tetrabromide (WBr4) and tungsten pentabromide (WBr5) have some differences in physical and chemical properties.
Molar mass: The molar mass of tungsten tetrabromide is low, about 392.6 g/mol, while the molar mass of tungsten pentabromide is high, about 477.3 g/mol.
Melting point: Tungsten tetrabromide has a lower melting point of about 128°C, while tungsten pentabromide has a higher melting point of about 256°C.
Density: Due to the difference in the number of bromine atoms in the molecule, tungsten pentabromide has a higher density of about 4.79 g/cm³, while tungsten tetrabromide has a lower density of about 3.54 g/cm³.
Thermal stability: Tungsten pentabromide is relatively stable at high temperature and can be heated to a higher temperature in the air without being easily decomposed, while tungsten tetrabromide is relatively unstable at high temperature and may decompose into tungsten and bromide.
Solubility: Due to the difference in the number of bromine atoms, the solubility of tungsten tetrabromide and tungsten pentabromide is also different. Tungsten tetrabromide is soluble in some organic solvents, while tungsten pentabromide is not easily soluble in most organic solvents.
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