Question #e0a62

1 Answer
Oct 14, 2017

See explanation

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