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.
How do you think the average amount of air you exhale would be affected if you were to exercise? Count the number of breaths you normally take in one minute. Then calculate the average volume of air you exhale in one minute (number of breaths taken in one minute x the average volume of air you exhale in one breath). What is your answer? How much air do you exhale in one class period? Show your calculations.