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Sulfur trioxide (alternative spelling sulphur trioxide) is the chemical compound with the formula SO 3. It has been described as "unquestionably the most [economically] important sulfur oxide". [1] . It is prepared on an industrial scale as a precursor to sulfuric acid.

三氧化硫 （IUPAC 名： sulphur trioxide， 分子式： S O 3）是一种 硫 的 氧化物，有類似 二氧化硫 的氣味，溶於 水 中反應成 硫酸。 它的气体形式是一种严重的 污染物，是形成 酸雨 的主要来源之一。 在673K、1atm下，三氧化硫略有分解并达到平衡（三氧化硫含量99.2%），较低的温度与较高的压力有利于三氧化硫的稳定。 但1173K时，三氧化硫完全分解。 气态的SO 3 是一种具有D 3h 对称的 平面 正三角形 分子，含有一个离域的 键。 这与 价层电子对互斥理论 （VSEPR）所 …

Sulfur trioxide is the chemical compound with the formula SO3. In the gaseous form, this species is a significant pollutant, being the primary agent in acid rain

so3可以指： so 3 ，三氧化硫。 so 3 2-，亞硫酸根。 旋轉群，so(3)

SO3 may refer to Sulfur trioxide, SO 3, a chemical compound of sulfur and the anhydride of sulfuric acid; Sulfite, SO 2− 3, a chemical ion composed of sulfur and oxygen with a 2− charge; SO(3), the special orthogonal group in 3 dimensions; …

SO3 sulfur trioxide 3d molecule isolated on white. Download a free preview or high-quality Adobe Illustrator (ai), EPS, PDF vectors and high-res JPEG and PNG images.

Sulfur trioxide (SO3) is generally a colorless liquid. It can also exist as ice- or fiber-like crystals or as a gas. When SO3 is exposed to air, it rapidly takes up water and gives off white fumes. It can react with water to form sulfuric acid. SO3 is also called sulfuric oxide and sulfuric anhydride.

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