1. What is the empirical formula of a compound that is 58.80% barium, 13.75% sulfur and 27.45% oxygen by mass?
2. By chemical analysis, a molecular compound was found to consist of 80% carbon and 20% hydrogen by mass. By measuring the volume of a known mass of the compound in the gaseous phase, its molecular mass was found to be 30. Find the empirical and the molecular formulas of the compound.