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The density of molecules in the form of a gas can be calculated via Atomic Mass.

Pressure (pa) x Volume (m**3) = mols x Ideal gas constant (PaV/(mol*K)) x Temperature

PV=nRT

atomic mass = g/mol

density = mass/volume

PV=nRT

d=m/V

amu=m/n

amu*n=m

d=amu*n/V

PV=nRT

P/(RT)=n/V

d=(amu*P)/(RT)

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