How atoms of hydrogen are there in the formula #C_2H_5OH#? Chemistry The Mole Concept Determining Formula 1 Answer Pitufox27 Mar 5, 2017 Six Explanation: Just count them: 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 1406 views around the world You can reuse this answer Creative Commons License