What is the molar mass of Fe23 O ?A. 55.85 g/mol B. 120.76 g/molC. 159.67 g/mol D. 11.32 g/mol 2. Howmany moles are there in 82.5 g of Magnesium sulfate (MgSO4) ? A. 0.685 moles B. 5.00 moles C. 1.89 moles D. 0.989 moles A compound containing iron and sulfur was formed by combining 0.331 g of iron with 0.191 g of sulfur. What is the empirical formula of the compound? A. FeS4 B. FeS C. FeS3 D. Fe2S 4. In unit-4 , you learned writing the formulas of compounds. Since magnesium is a Group 2A element, it forms +2 ions: Mg2+. Since oxygen is a Group 6A element, it forms -2 ions: O2-. So based on these charges, predict the theoretical empirical formula of the compound formed between Mg & O2 A. MgO2 B. Mg2OC. Mg2O4 D. MgO Health Science Science Nursing CHEM 1020 Share QuestionEmailCopy link Comments (0)