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) |