Density, Moles, and Gases at STP

Nov 5, 2009 at 9:52 PM | Posted by blk A chemists

Density and Moles


Density=mass per unit volume

D=m/v V=m/D m=D x V


Density of Gases of STP


-1mole of gas

Dstp m/v= molar mass/22.4

Example:

Calculate the density of O2 at STP.

D= 32g/mol / 22.4L/mol =1.43g/L

DAIR= 1.5g/L


Density--(M,D,V)--Mass--(Molar Mass)--Mole--(6.02x10 power of 23)--Molecules

Mole--(22.4)--Volume of STP

Molecules--(subscripts)--Atoms

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