2006-08-24 08:06:40 · 4 answers · asked by Ricky 1 in Science & Mathematics ➔ Chemistry
You'd need to to take into account the different molar masses of nitrogen and oxygen. Molecular nitrogen is 28 g/mol, and molecular oxygen is 32 g/mol. So it's actually 0.075 * 32/[(32*0.21)+(28*0.79)]
2006-08-24 13:53:26 · answer #1 · answered by qda 3 · 0⤊ 1⤋
Im gonna make believe you said cubuc foot (cu-ft) and not square ft since gas is measured in volume and not area.
At STP the density of air is 0.075 lb per cu-ft.
Of that 79% is Nitrogen, 20.9% is Oxygen. Therefore 0.075 * 0.209 = 0.157 lb per cu-ft Oxygen @STP. That is about a quarter ounce per cu-ft.
2006-08-24 16:50:03 · answer #2 · answered by BRUZER 4 · 0⤊ 1⤋
approx.18% at sea level
2006-08-24 15:13:58 · answer #3 · answered by Anonymous · 0⤊ 1⤋
only 20.9% & 1.1 % green house & 78 % nitrogen
2006-08-24 15:24:18 · answer #4 · answered by JOHNNIE B 7 · 0⤊ 1⤋