Chemistry
Ideal Gas Concentration Calculator
Calculate molar and mass concentration, amount, and mass for a gas with an optional compressibility-factor correction.
Absolute temperature (K)-
Gas molar concentration (mol/L)-
Gas molar density (mol/m³)-
Gas mass concentration (g/L)-
Gas amount in entered volume (mol)-
Gas mass in entered volume (g)-
Decision view
Pressure-temperature gas vessel with concentration surface
Pressure-temperature gas vessel with concentration surfaceA live piston shows inverse temperature and direct absolute-pressure effects while Z separates ideal and real-gas behavior.
Exact scenario comparisonGas temperature (°C) changes while all other entered assumptions remain constant.
| Gas temperature (°C) | Absolute temperature (K) | Gas molar concentration (mol/L) | Gas molar density (mol/m³) | Gas mass concentration (g/L) | Gas amount in entered volume (mol) | Gas mass in entered volume (g) |
|---|
How to use Ideal Gas Concentration Calculator
- Enter absolute pressure, not gauge pressure.
- Convert the measured gas temperature through the provided Celsius input.
- Use Z=1 for an ideal screen or a sourced real-gas factor.
Calculator guide
Understanding Ideal Gas Concentration Calculator
Gas concentration follows pressure divided by absolute temperature. The ideal-gas relationship must use absolute pressure, kelvin, and a consistent gas constant.
Detailed calculation process
Detailed ideal-gas concentration calculation
The default state is 101.325 kPa absolute, 25°C, Z=1, 50 L, and molar mass 44.01 g/mol.
General formula: T_K=T_C+273.15c=P/(ZRT)ρ=cMn=cVm=nM The gas law gives moles per liter directly when R uses kPa·L units. Molar mass converts amount concentration to mass concentration.
What each symbol means
Worked substitution with the default inputs
The default gas is about 0.04087 mol/L and 1.799 g/L, with roughly 2.044 mol in 50 L.
Worked situations
Practical examples
- At 101.325 kPa and 25°C with Z=1, concentration is about 0.04087 mol/L.
- Fifty liters of a 44.01 g/mol gas then contains about 2.044 mol and 89.95 g.
Better inputs
Useful tips
- Use a property source for Z at elevated pressure.
- Keep wet-gas and dry-gas bases distinct.
- Correct sampled gas to the actual pressure and temperature.
Before relying on the result
Limitations and common mistakes
- One uniform equilibrium state is assumed.
- Mixture composition, humidity, adsorption, phase change, and uncertainty are omitted.
- Z is externally supplied and constant.
Reference
Key terms
- Absolute pressure
- Pressure referenced to vacuum.
- Compressibility factor
- Z correction for deviation from ideal gas behavior.
- Molar concentration
- Gas moles per liter at the stated state.
Important note
Use calibrated absolute pressure and temperature, an appropriate Z value, and composition-specific properties for process, safety, or regulatory calculations.
Frequently asked questions
Can I enter gauge pressure?
No; add local atmospheric pressure to obtain absolute pressure first.
Why does hotter gas have lower concentration?
At fixed pressure, thermal expansion increases volume per mole.
What gas constant is used?
8.314462618 kPa·L/(mol·K), consistent with the entered units.