How far is the structure of alveoli suitable for the exchange of respiratory gases like oxygen and carbon dioxide?

How is carbon dioxide produced?

A person inhales to his maximum capacity and then he exhales also to his maximum. Suppose he hold his breath after that maximum expiration for 5 seconds would there be any exchange of respiratory gases occuring in lungs during that period. How?

12 g of carbon reacts with 32 g of oxygen to form 44 g of carbon dioxide.

Controlled oxidation of alkanes in the presence of suitable catalysts give a variety of products. Free rotation about a carbon - carbon single bond is permitted in an alkane molecule. What are conformers? Draw the structure of the eclipsed and staggered conformers of ethane in Sawhorse and Newman projection and explain their relative stability.