Gas Molar Mass Calculator

Calcolatore di Massa Molare (Gas)

Legge dei gas ideali: PV = nRT → M = m·R·T / (P·V) oppure M = d·R·T / P.
Costante usata: R = 8,314462618 J·mol⁻¹·K⁻¹ (SI).

Modalità di calcolo
Da campione
Suggerimenti: usa la stessa temperatura per tutti i dati (°C o K). A 0 °C e 1 atm (circa STP), l’aria secca ha densità ≈ 1,29 g/L. Il modello dei gas ideali è un’approssimazione: per gas reali o alte pressioni può servire un fattore di comprimibilità Z.

The Molar Mass of a Gas Calculator by UtileApp lets you easily determine the molar mass of a gas using the ideal gas law.
Simply enter your experimental data — mass, volume, pressure, and temperature — or use the gas density directly to obtain the molar mass in g/mol.

Main formulas

📘 From a known sample: M=m⋅R⋅TP⋅VM = frac{m cdot R cdot T}{P cdot V}M=P⋅Vm⋅R⋅T​

📗 From density: M=d⋅R⋅TPM = frac{d cdot R cdot T}{P}M=Pd⋅R⋅T​

Main features

🔹 Supports multiple units: atm, bar, kPa, Pa, mmHg, L, mL, m³, °C, and K.
🔹 Automatic use of the ideal gas constant (R = 8.314 J/mol·K).
🔹 High precision results with up to 6 decimal places.
🔹 Two calculation modes: from sample data or density.

Use and benefits

Perfect for students, teachers, and laboratory professionals, as well as anyone analyzing gases or identifying unknown gas samples.
This tool simplifies calculations and minimizes conversion errors, providing clear and accurate results instantly.

Example

A gas with a density of 1.25 g/L at 1 atm and 273.15 K has: M≈28.97 g/molM ≈ 28.97 text{g/mol}M≈28.97 g/mol

— approximately the molar mass of air.

With this calculator, you can understand and verify gas behavior quickly and accurately using fundamental gas laws.oprietà molecolari dei gas, direttamente dal browser!