Assuming air to be a mixture of gasses by volume of 20% oxygen and 80% nitrogen,(Both diatomic gasses), calulate the mass of 1dm cube of air at STP?.

Answer 1

N2 is 28 x 0.80 = approx 23
O2 is 32 x 0.20 = approx 6
Total approx 29

Answer 2

not sure at all for the correct answer