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Oleum (Latin for “oil”), often known as fuming sulfuric acid, is a name that refers to sulfuric acid solutions containing varying compositions of sulphur trioxide, or more specifically, disulfuric acid (also known as pyrosulfuric acid).
The formula for oleums is ySO3.H2O, where y is the total molar mass of sulphur trioxide concentration. The value of y can be changed to accommodate various oleums. They can alternatively be expressed using the formula H2SO4.xSO3, where x is the molar free sulphur trioxide content. The free SO3 The component of oleum is typically measured by mass.
Structure of Oleum:
