molar volume
Let an agent handle molar volume by substance, conditions, calculation and use in chemistry, stating the reference conditions explicitly.
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 handle molar volume by substance, conditions, calculation and use in chemistry, stating the reference conditions explicitly.
The volume occupied by one mole of a substance at a given temperature and pressure, measured in cubic metres per mole; for an ideal gas it is about 22.71 L/mol at 0 degC and 100 kPa, or 22.41 L/mol at 0 degC and 101.325 kPa.
What it is for: Relating amount of substance to volume in chemistry and engineering.
It can be compute molar volume from density and molar mass; use ideal gas molar volumes at stated conditions; correct for non-ideal behaviour; convert between mass, moles and volume.
Distinguishing features
Volume per mole
Depends on temperature and pressure
Near-constant for ideal gases at given conditions
Varies for liquids and solids
What it looks like
Not visible; a computed or tabulated quantity.
Physical character
ideal gas, 0 degC and 100 kPa: about 22.71 L/mol - IUPAC STP
ideal gas, 0 degC and 101.325 kPa: about 22.41 L/mol - older convention
How it is recognised
Units m3/mol or L/mol
Reference conditions such as STP
Specific volume is per unit mass instead
Related models
is a kind of - category
is related to - relation
is related to - quantities
is contrasted with - per mass
In practice
Families and kinds
molar volume of gases
molar volume of liquids
molar volume of solids
partial molar volume
Standards and regulation
IUPAC Green Book
ISO 80000-9
Failure modes and hazards
Using the wrong reference conditions
Applying ideal values to real gases at high pressure
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.
Value Computation.
Conditions decide values.
Compute
From data.
Compute
Computation.
- What is the molar volume from density and molar mass? measurement
- In which units? definition
Conditions
Reference state.
Conditions
Reference conditions.
- Which temperature and pressure are assumed? definition
- Which STP convention is used? boundary
Gases Ideal and real.
Real gases deviate.
Ideal
Ideal gas law.
Ideal
Ideal gas.
- What is the ideal gas molar volume at these conditions? measurement
- Is the ideal approximation valid? boundary
Real
Corrections.
Real
Real gas.
- What correction, such as the compressibility factor, is needed? measurement
- From which equation of state? provenance
Condensed Liquids and solids.
Condensed phases vary.
Liquids
Values.
Liquids
Liquid molar volume.
- What is the molar volume of this liquid at this temperature? measurement
- From which data source? provenance
Mixtures
Partial molar volume.
Mixtures
Mixtures.
- Does mixing change the total volume? boundary
- How is partial molar volume used? definition
Teaching Learning.
Clear conventions help.
Explain
Simple terms.
Explain
Explanation.
- How can molar volume be explained with an example? action
- Which convention does the syllabus use? provenance
Errors
Common mistakes.
Errors
Common mistakes.
- Is an outdated STP value being used? boundary
- How can it be corrected? action
What the second pass must settle
- Should partial molar volume be a separate entry?
- How should reference conditions be recorded?
- How should real-gas corrections be linked?