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Answer 1 · 2017-10-14T17:10:34

See explanation

We will use the ideal gas law pV=nRT.

Rearrange the equation to have n(moles) as subject:

#n = (pV)/(RT)#

This is done in standard conditions so you put the values for standard conditions into the equation to work out the moles :

The elephant trap: the volume is 30L; needs to be in #m^3#. #30L = 0.03m^3#

#n= (101*10^3*0.03)/(8.31*298.15) = 1.22# moles

Multiply the moles by Avogadro's constant to work out the number of particles/molecules in one mole of oxygen.

#1.22*6.02*10^23 = 7.36*10^23# oxygen atoms/ molecules present