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Gas Mixture Analysis

Choose one explicit mole or mass basis for every component. The calculator checks the total and reports mixture molar mass with both derived fraction sets.

FreeNo sign-upPrivate — runs in your browser, nothing is uploaded

Declare 2–20 components on one explicitly selected basis. Fractions must add to exactly one; changing basis converts the current valid composition using pinned conventional molar masses.

Composition basis
0.026713524 kg/molMixture molar mass · mole fractions: nitrogen 0.95, hydrogen 0.05 · mass fractions: nitrogen 0.996226855, hydrogen 0.003773145

Admitted real-mixture check

Only the N₂/O₂ 79/21 binary and fixed dry-air recipe are admitted in this launch scope. The runtime receives pinned recipe IDs only; a missing model or non-finite state remains unavailable rather than being approximated.

Choose an admitted request and declared state.

Concentration example

The mass concentration uses the selected gas's pinned conventional molar mass and the declared ideal temperature and absolute pressure. Wet reporting requires an explicit water mole fraction.

0.05%unchanged dry mole basis
490 ppmvwet basis at stated water fraction
348.052708 mg/m³ideal state conversion
Verify a saved calculation passport

Paste a local passport JSON to verify its envelope and SHA-256 hashes in this browser. This checks integrity only; it does not rerun the physical calculation.

No saved passport has been verified in this view.

Quick answer

Mole fraction and mass fraction are not interchangeable. The pinned component molar masses connect them only after every component identity and one basis are declared.

Formula & method

Mmix = Σ(xᵢMᵢ); wᵢ = xᵢMᵢ / Mmix; xᵢ = (wᵢ/Mᵢ) / Σ(wⱼ/Mⱼ)
  • basis — declared physical interpretation and units

All calculations retain their declared conditions and do not invent missing physical context.

Examples

Example 1: Declared workflow
Input
5 mol% H₂ with 95 mol% N₂ yields a declared mixture molar mass and both component fraction sets.
Result
A labeled browser-local result or an explicit unavailable state
Why
The result keeps the required material, state and model context visible.
Example 2: Missing input
Input
A required material, basis or state is absent
Result
Needs-input status
Why
The workspace asks for the missing dependency instead of assuming it.
Example 3: Unsupported request
Input
A request outside the admitted capability
Result
Unavailable status
Why
No ideal or zero-valued fallback is substituted.

When to use this tool

  • Finding mixture molar mass.
  • Converting a declared mole composition to mass fractions, or the reverse.
  • Checking a two-to-twenty component recipe.

Common mistakes

  • Mixing mole and mass fractions in one table.
  • Accepting a fraction total that is not one.
  • Treating dry air as an unnamed universal gas.

Assumptions

What the result takes for granted:

  • All rows use one explicitly selected basis.
  • Fractions sum to one within numerical tolerance.
  • Real mixture EOS is separately admitted.

Limitations

Where this tool stops — and what to use instead:

  • Reactive and arbitrary real-mixture phase calculations are excluded.
  • No composition is inferred from a product name.
  • Each component must exist in the pinned catalog.

Frequently asked questions

Does this send my data to a server?

No. This gas workspace processes the declared inputs in your browser.

Why can a result be unavailable?

The requested material, state, output or interpretation may need information that has not been declared or is outside the admitted capability.

Can I rely on this for safety-critical work?

No. Verify the stated basis and use applicable standards, instrument data and qualified engineering review for safety-critical or custody-transfer decisions.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

  • ✓ Free to use
  • ✓ No sign-up required
  • ✓ Runs entirely in your browser — nothing is uploaded.
  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

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