What is the correct way to show carbon dioxide in the gas phase?

a. CO (g)

b. CO2 (g)

c. CO2 (s)

d. CO2 (gp)

The correct way of showing carbon dioxide in the gas phase is b. CO2 (g)

This notation is commonly used in showing chemical reactions wherein the phases of the constituents are important. Gases are denoted by (g), solids are denoted by (s), and liquids are denoted by (l). Aqueous solutions are also denoted (aq).