What is the chemical formula for the combination of cobalt (II) and chlorine? Chemistry The Mole Concept Determining Formula 1 Answer anor277 Nov 1, 2016 #"Cobaltous chloride"# is #CoCl_2#, Explanation: The #"ous"# endings traditionally denoted the lower oxidation states. Anhydrous #CoCl_2# is a light blue powder. Its coordination complex with water is a beautiful purple colour. Answer link Related questions Is it possible to find a molecular formula from molar mass? Question #75781 What are some common mistakes students make when determining formulas? How can I determine the formula of an acid? How can I determine the chemical formula of a product? How can I determine the empirical formula of a compound? How can I determine the formula of a hydrate? What does the empirical formula indicate? A molecule with molecular weight of 180.18 g/mol is analyzed and found to contain 40.00% carbon,... Do I need to know the number of moles of each element to determine the formula of the compound? See all questions in Determining Formula Impact of this question 2112 views around the world You can reuse this answer Creative Commons License