Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which contains both of those minerals) and is the main component of pearls and the shells of marine organisms, snails, and eggs.
An ordinary breath for a 70-kg adult is about 500ml of air. We call this the tidal volume. Since oxygen is 21% by volume of air, then the volume of oxygen inhaled is about 105ml. The density of pure oxygen at sea level is 1.43kg per cubic metre.
In a lifetime (of 67.2 years) we have 35,344,512 minutes (so you have about 35 million minutes of breathing space). An average person will breathe 0.5 (liters/breath) x 15 (breaths/minute) x 35,344,512 (minutes/lifetime), which equals 265,083,840 liters/lifetime. More or less 265 million liters of air.