Does 109% oleum contain 109% sulfuric acid by mass?

No. The label describes equivalent sulfuric acid after hydration relative to the initial sample mass. In the simplified SO₃/H₂SO₄ model it corresponds to 40% free SO₃ by mass.

Why is 122.5 the upper label in this model?

With rounded molar masses, 100 g SO₃ can form 122.5 g H₂SO₄ after consuming 22.5 g water. This is the limiting equivalent-acid value for the lab’s two-component calculation model.

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LIVE LAB 15 • MOLE CONCEPT & STOICHIOMETRY

Oleum Labelling 3D Lab

Build the mass balance of oleum in a rotatable 3D laboratory, vary the percentage label from 100 to 122.5, run virtual hydration and practise worked Mole Concept questions.

Foundation to AdvancedFoundation • Core • AdvancedRotatable 3D mass-balance lab + question slidesPersonal study

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Oleum Labelling 3D Lab — actual simulation with its model and controls

ACTUAL LAB PREVIEW

Oleum Labelling 3D Lab

Oleum Labelling 3D Lab

Start with the concept.

Oleum percentage labelling and mass balance

Why a label can exceed 100%

Derive the relationship

A 109% oleum example

Questions students ask while mastering this concept.

Find this concept in your chemistry course

Questions & observations

Oleum Labelling 3D Lab

Oleum Labelling 3D Lab

Start with the concept.

Oleum percentage labelling and mass balance

Why a label can exceed 100%

Derive the relationship

A 109% oleum example

Questions students ask while mastering this concept.

Connect this lab with nearby concepts.

Hydration Energy & Ionic Mobility

Graham’s Law & Molecular Speeds 3D Lab

Inorganic Compounds for Chemical Bonding 3D Lab

Find this concept in your chemistry course

Questions & observations