Sulfur trioxide · SO3

Sulfur trioxide: formula SO3, atom count, element breakdown and calculated molar mass.

CompoundSO₃

SO₃

Molar mass80.057 g/mol

Atoms4

Elements2

Oxygen

3 × 15.999 · 59.95%

47.9970

Sulfur

1 × 32.06 · 40.05%

32.0600

The formula SO₃ contains 4 atoms in total. Numbers after element symbols show how many atoms of each element are present.

Molar mass is the sum of the contributions shown above. The percentages show how much each element contributes to the total mass.