This is an intermediate stage in the preparation of sulfur trioxide.

HO where y is the total molar sulfur trioxide content.

Liquid sulfur trioxide has vapor pressure consistent with the gamma form.

This requires some care to prevent overheating and evaporation of sulfur trioxide.

As sulfur trioxide is centrosymmetric, it has no electrical dipole.

It is made by dissolving sulfur trioxide in sulfuric acid.

The public health risks associated with emissions and chemical spills, especially of sulfur trioxide, are major concerns for the entire area.

A common process is the continuous reaction of dimethyl ether with sulfur trioxide.

Sulfur trioxide is mentioned in the Emergency!

The conversion typically uses sulfur trioxide or chlorosulfuric acid.

The industrially practiced method typically uses sulfur trioxide gas.

This can be accomplished by reacting cyclohexylamine with either sulfamic acid or sulfur trioxide.

At or above 340 C, sulfuric acid, sulfur trioxide, and water coexist in significant equilibrium concentrations.

For example, sulfur trioxide is not produced quantitatively in combustion of sulfur.

Usually the sulfonating agent is sulfur trioxide.

This reaction is reversible and the formation of the sulfur trioxide is exothermic.

Alkali sulfates are formed from sulfur trioxide and sodium-containing compounds.

The sulfonation agent is oleum, a solution of sulfur trioxide in sulfuric acid.

Upon standing with excess sulfur trioxide, it decomposes to pyrosulfuryl chlorides:

Sulfur trioxide can be prepared in the laboratory by the two-stage pyrolysis of sodium bisulfate.

For instance, sulfur forms the toxic sulfur dioxide and sulfur trioxide.

When they reach temperatures above 300 C, sulfuric acid begins to decompose into sulfur trioxide and water, both in the gas phase.

The sulfur dioxide is oxidized to sulfur trioxide.

To avoid confusion, if the context does not make it clear, sulfur trioxide should be as SO3(gas, liquid,solid) whichever is appropriate.

In the presence of water, sulfur trioxide (SO) is converted rapidly to sulfuric acid: