Question

Question #e0a62

Answer 1

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