an organic compound contains c, h, n, and o. combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of co2 and 0.0991 g of h2o. a sample of 0.4831 g of the compound was analyzed for nitrogen by the dumas method (see exercise 71). at stp, 27.6 ml of dry n2 was obtained. in a third experiment, the density of the compound as a gas was found to be 4.02 g/l at 1278c and 256 torr. what are the empirical formula and the molecular formula of the compound?