- #1
mesa
Gold Member
- 695
- 38
So I need a check on my calculations for the average number of atoms in a 1 meter cube of atmosphere at STP.
I came up with 88.14 mols, here is how I did it:
First I calculated the average amu using percentage in air by
Nitorgen 78.08% @ 14.007 amu
Oxygen 20.95% @ 15.999 amu
Argon .93% @ 39.948 amu
I took these numbers and multiplied them by their relative percentages to get average amu for atmosphere:
10.94 + 3.35 + .37 = 14.67 amu average
We know the average density of air at STP is 1.293x10^3g/m^3
so I divided by average amu and got 88.14 mols/m^3
Is this right?
I came up with 88.14 mols, here is how I did it:
First I calculated the average amu using percentage in air by
Nitorgen 78.08% @ 14.007 amu
Oxygen 20.95% @ 15.999 amu
Argon .93% @ 39.948 amu
I took these numbers and multiplied them by their relative percentages to get average amu for atmosphere:
10.94 + 3.35 + .37 = 14.67 amu average
We know the average density of air at STP is 1.293x10^3g/m^3
so I divided by average amu and got 88.14 mols/m^3
Is this right?