Carbon dioxide is a compound formed by the sharing of two pairs of electrons between each of the two atoms of oxygen and one atom of carbon. This leads to the formation of a double covalent bond between the atoms of oxygen and carbon.
Carbon dioxide occurs in nature, and about 0.04 percent of the atmosphere consists of carbon dioxide. Carbon dioxide is essential for the photosynthesis that takes place in the leaves of green plants. Carbon dioxide remains a gas at normal temperature and pressure. It is soluble in water and has a molar mass of 44.01 grams per mole.