No , it makes up 20.9% of air , almost 21%
5
they are both equal
6 litres of 50% + 4 litres of 25%
40%% rate:= 51.2/128 * 100%= 0.40 * 100%= 40%
40%=30x .4=30x .4/30 = .01333333333333333333333333333333333333333333333333333333333333
400 mL or 0.4 L
40 percent
3.5
S2o3
The brain consumes 40% of the oxygen in your blood.
320.0 mm Hg
no
makes 40% oxygen than lower altitude
15% + 25% = 40%
=0.142857.. of the original volume.
We can't tell. What's the other 90 percent? If you meant 40/60 instead... the mass of sulfur is twice that of oxygen, so a mass ratio of 40:60 is equivalent to an atom ratio of 1:3. The empirical formula would be SO3.
Red blood cells (corpuscles)
actually we dont mix nitrogen nor oxygen we use normal fresh air. The normal Air is 21% oxygen + 78% Nitrogen + 1% others. As humans more oxygen can be toxic for us especially underwater. However, in some cases "Like with Nitrox" we add more oxygen to make the percentage up to 40%, but this require specific training and certification.