Molar Mass of Gas Calculator

Find a gas's molar mass from its density.

Molar mass (g/mol) 43.931

Formula: M = d·R·T ÷ P, R = 0.08206

Step-by-step with your numbers:

1. Values used:

2. Density = 1.96 g/L

3. Pressure = 1 atm

4. Temperature = 273.15 K

6. Molar mass = 43.931g/mol

Did we solve your problem today?

Derive a gas's molar mass from its density using the ideal gas law.

The math behind it

M = density × R × T ÷ P (R = 0.08206 L·atm·mol⁻¹·K⁻¹).

CO₂ (1.96 g/L, 1 atm, 273 K) → ~43.9 g/mol.

Density units?

Use g/L for the molar mass to come out in g/mol.