Molecular Formula Posted on 7th December 201516th May 2021 by ThePD (The Project Definition) Molecular Formula is a chemical formula that is the expression of the number and type of atoms in a molecule of a substance. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Science and tagged chemistry, science. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.