amount of substance
Let an agent explain amount of substance and the mole, relay definitions and usage from metrology and chemistry references, describe calculations with molar mass and concentration, and distinguish amount of substance from mass, number and dose quantities.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain amount of substance and the mole, relay definitions and usage from metrology and chemistry references, describe calculations with molar mass and concentration, and distinguish amount of substance from mass, number and dose quantities.
A base quantity of the International System of Units that measures the number of specified elementary entities such as atoms, molecules or ions in a sample, with the mole as its unit defined since 2019 as exactly 6.02214076 times ten to the twenty-third entities, used in chemistry to relate mass to numbers of particles through molar mass and in forms such as the amount of a component, initial and equilibrium amounts in reactions and trace quantities; the registry aliases absorbed dose and lethal dose belong to other quantities.
What it is for: Counting entities in chemistry.
It can be explain the quantity and mole; relay definitions and usage; describe calculations; distinguish from other quantities.
Distinguishing features
Counts entities
SI base quantity
Exact Avogadro definition
Chemical calculations
What it looks like
Not a visible object; a quantity in equations.
Physical character
SI unit: mole unit - symbol mol
Avogadro constant: 6.02214076e23 per mole - exact since 2019
molar mass of carbon-12: about 12 g/mol - no longer exactly 12
How it is recognised
SI base quantity counting entities
Mole, molar mass, amount of component, initial and equilibrium amounts, trace quantities
Mass is measured in kilograms; absorbed dose is energy per mass; lethal dose is a toxicology measure
Related models
is a kind of - in registry terms
is a kind of - in registry terms
is measured in - the SI unit
is related to mass by - of the substance
In practice
Families and kinds
amount of substance of a pure sample
amount of substance of a component in a mixture
initial and equilibrium amounts in reactions
trace quantities
amount concentration and molality as derived quantities
Identifiers
ISO 80000-9 amount of substance physical chemistry quantities
SI mol base unit
Standards and regulation
SI Brochure and 2019 redefinition
ISO 80000-9
IUPAC Green Book
Failure modes and hazards
Confusing amount of substance with mass or number
Registry aliases mixing in dose quantities
Ambiguity about which entity is counted
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What amount of substance is.
Science.
Definition
Definition and the mole.
Definition
Definition.
- What is amount of substance, and how is the mole defined since 2019? definition
- Is the question about amount of substance, mass, number of entities or a dose quantity? boundary
Forms
Forms of the quantity.
Forms
Forms.
- What are the amount of a component, initial and equilibrium amounts, and trace quantities? definition
- Which entry fits the specific form? action
Compute Calculations.
Practice.
Molar
Molar mass and concentration.
Molar
Molar.
- How are amount, mass, molar mass and concentration related in calculations? action
- Which references are standard? provenance
Stoichiometry
Stoichiometry.
Stoichiometry
Stoichiometry.
- How is amount of substance used in reaction stoichiometry and equilibrium calculations? action
- Which entry fits stoichiometry? action
Measure Measurement.
Science.
Realisation
Realising the mole.
Realisation
Realisation.
- How is the mole realised in practice, and what was the Avogadro project? provenance
- Which sources are cited? provenance
History
History of the mole.
History
History.
- How did the mole develop from Avogadro and Ostwald to the 2019 redefinition? provenance
- Which entry fits the history of the mole? action
Context Teaching and related quantities.
Context.
Teaching
Teaching.
Teaching
Teaching.
- How is the mole taught, and what misconceptions arise? provenance
- Which entry fits chemistry education? action
Related
Dose quantities.
Related
Related.
- What are absorbed dose and lethal dose, and why are they distinct from amount of substance? provenance
- Which entry fits absorbed dose? action
What the second pass must settle
- Should the mole be the primary linked entry?
- How should metrology references be linked?
- The registry entry has merged aliases naming dose quantities; should they be corrected?