A gas in a container at 30∘C and 1.5atm pressure has 2.0mol of molecules.

The volume is unknown but the density can be calculated from the mass using the ideal.

Gas law: PV = nRT or PV = (2 mol)(1/22) × (8.314 J/K mole K) = 517,054 J/(mole·K).

Unit SI a not is gram because is This.

gas station, 1950s, blender @ Pixabay

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