CH4 = 12+4 = 16 grams / mole
He = 4 grams/mole
O2 = 16*2 = 32 grams/mole
N2 = 14*2 = 28 grams/mole
By the way
H2O = 2+16 18 grams/mole
so water vapor is lighter than air which is about 80% N2 and 20% O2
(steam rises :)
A water vapor molecule is also much smaller than an average molecule of air, so it is possible to make a filter (house wrap for example) which lets water vapor pass through but not air or liquid water.
if CH4, He, O2, and N2 are at the same temperature then which one is the least dense
1 answer