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the organic solvent thiophene is a carbon-hydrogen-sulfer compound that yields co2, h2o, and so2 when burned in an excess of oxygen. When subjected to combustion analysis, a 1.3020 g sample of thiophene produces 2.7224 g co2, 0.5575 g h2o, and 0.9915 g so2. What is the empirical formula of thiophene?