Calculate the molecular formula for a compound that contains 80.0 % C and 20.0 % H with a molar mass of 30.00 g. a. CH b. CH c. CH d. CH A compound with the empirical formula N 02 was found to have a molar mass of 92.00 g. What is the molecular formula? a. NO b. NO c. NO6 d. NOs Calculate the empirical formula for a compound that contains 2.233 g Fe and 1.926 g S? a. FeS b. Fe,S c. Fes d. Fe,S, Calculate the empirical formula for a compound that contains 56.68 % K, 8.68 % C and 34.73% 0. Calculate the empirical formula for a compound that contains 11.19% H and 88.79% 0. From the chemical equation below, how many molecules of oxygen are needed to burn 2 molecules of propane (CH)? CH +50 3 CO + 4HO