What does this formula represent: #NO_x#? Chemistry Covalent Bonds Covalent Formulas and Nomenclature 1 Answer G_Ozdilek · Grace Apr 3, 2017 It is used for nitrogen oxides. Explanation: #NO, NO_2, NO_3, N_2O, N_2O_3, N_2O_4#, and #N_2O_5#. But only two of them are important: #NO# (nitrogen monoxide or nitric oxide) and #NO_2# (nitrogen dioxide) in air pollution. Answer link Related questions What is the chemical formula for sugar? What chemical formula represents a carbohydrate? What is the chemical formula for gold? What is the chemical formula for a diamond? How do you find formulas for covalent compounds? What are common mistakes students make with empirical forumlas? What are empirical formulas? What are some examples of empirical formulas? When naming a covalently-bonded molecule, how would you write the prefix if you had four atoms... What is the chemical nomenclature for CH3Cl? See all questions in Covalent Formulas and Nomenclature Impact of this question 1518 views around the world You can reuse this answer Creative Commons License