In the lungs the respiratory membrane separates tiny sacs of air (pressure 1.00*10^5 Pa) from the blood in the capillaries. These sacs are called alveoli. The average radius of the alveoli is 0.125mm,and the air inside contains 14% oxygen. Assuming that the air behaves as an ideal gas at 310k,calculate the number of oxygen molecules in one of these sacs.

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Diatomic Gas

Molecule, is a collection of two or more atoms together (which constitute the smallest observable unit) into a pure material. There are some ways to represent the structure of a molecule. Factor symbols represent atoms in Lewis structures, and dots represent electrons that accompany them. A pair of mutual electrons (covalent bond) may be represented by a single dash. The ball-and-stick model depicts the spatial structure of the atoms better.