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Ideal Gas Law: PV=nRT

Density: d=m/V

Molar mass: M=m/n

The molar mass of oxygen gas (O2) is 32.00.

PV=nRT

PV=mRT/M

m/V=PM/RT

d=PM/RT

d=(2atm)(32g/mol)/[(.08206atmL/Kmol)(400K)]

d=1.95g/L

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