The density of air under standard laboratory conditions is 1.29 kg>m3, and about 20% of that air consists of oxygen. Typically, people breathe about 1 2 L of air per breath. (a) How many grams of oxygen does a person breathe in a day? (b) If this air is stored uncompressed in a cubical tank, how long is each side of the tank? 1.54 ... A rectangular piece of