Dibutyl succinate, an insect repellent contains only O, H and C and was found to have an experimentally determined molar mass of 231 g/mol. When a 2.5 g sample was burned in excess oxygen, 3.251 L of gas were collected at 0.98 atm and 25 oC. In addition, 2.157 ml of H2O (density = 0.997 g/mol) were also collected. What are the % weight of C, H and O in the sample, the empirical formula and the molecular formula.