Tungsten tetrabromide (WBr4) and tungsten tribromide (WBr3) are two different compounds, and there are some differences in their physical and chemical properties.
- Chemical formula and molar mass: The chemical formula of tungsten tetrabromide is WBr4, and its molar mass is 347.55 g/mol; the chemical formula of tungsten tribromide is WBr3, and its molar mass is 354.52 g/mol. Due to different chemical formulas and molar masses, their stoichiometric ratios and masses of substances are also different.
- Solubility: Tungsten tetrabromide is soluble in many common organic and inorganic solvents, such as ether, benzene and methylene chloride. However, tungsten tribromide has poor solubility and can only be dissolved in some specific solvents, such as molten sodium chloride and lithium solutions.
- Acidity and alkalinity: Both tungsten tetrabromide and tungsten tribromide are halides, which can react with some acids and alkalis. However, due to the different oxidation states of tungsten, tungsten tetrabromide may exhibit stronger acidity in the reaction, while tungsten tribromide is relatively weaker.
- Crystal structure: The crystal structures of tungsten tetrabromide and tungsten tribromide are different, which also leads to differences in their physical properties. The crystal structure of tungsten tetrabromide belongs to the hexagonal crystal system, while the crystal structure of tungsten tribromide belongs to the orthorhombic crystal system.
- Thermal stability: The thermal stability of tungsten tetrabromide and tungsten tribromide is also different. Tungsten tetrabromide is relatively stable at high temperature and is not easy to decompose; while tungsten tribromide may decompose into tungsten and bromide at high temperature.
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