Sulfur trioxide

Sulfur trioxide, SO3, is a powerful dehydrating agent, is obtained by oxidation of sulfur dioxide, SO2. Sulfuric acid by heating it follows SO3. Sulfur trioxide crystallizes in prismatic needles, has a normal melting point of 16.8 ºC and a normal boiling point of 44.88 ºC.

Under suitable conditions, sulfur reacts with oxygen in the air to produce sulfur dioxide (SO2, dense gas, colorless smell of burning sulfur, is very toxic. It is a very reducing agent soluble in water.), Which produces the other oxidation sulfur trioxide or sulfur trioxide (SO3) and this can react with water vapor in the air to produce sulfuric acid.

Basic properties:
Properties Value
chemical formula SO3
molecular weight 80.063 g/mol
phase liquid (at STP)
melting point 16.8 °C
boiling point 44.7 °C
density 1.97 g/cm3
solubility reacts in water

Liquid properties:
Properties Value
density 1.97 g/cm3
vapor density 280 mmHg
dynamic viscosity 0.00159 Pa s (at 30 °C)