The following data were obtained from experiments to find the molecular formula of a compound that contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 3.54-g sample of the compound with excess O2 formed 8.58 g CO2 and 2.70 g H2O. Another sample of mass 2.35 g was found to contain 0.279 g of N. The molar mass of the compound was found to be 236 g/mol. Determine the molecular formula of the compound.