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# What is the density of O2 at STP?

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- NorrieLv 71 decade agoFavorite Answer
1 mole. of O2 = 32g.

1 mole. at STP occupies 22.4L.

Density = Mass / Volume.

Density of O2 at STP = 32g / 22.4L = 1.43g/L = 1.43kg/m³

- pisgahchemistLv 71 decade ago
D = m/V -- equation for density

PV = nRT -- ideal gas equation

PV = mRT / M -- where m=mass, M=molar mass

P = mRT / VM -- put V on right hand side, under m

P = DRT / M -- m over V equals density

D = PM / RT -- solve for density, then plug in the numbers

D = 1.00 atm x 32g/mol / (0.0821 Latm/molK) / 298K

D = 1.31 g / L (at STP)

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that is incorrect, STP defines K = 273, otherwise this is the right equation to use...