A compound contains only carbon, hydrogen, nitrogen and oxygen. Combustion of 0.314 g of the compound produced 0.426 g CO2, and 0.0620 g H2O. In another experiment it is found that 0.103 g of the compound produces 0.0460 g of NH3. What is the empirical formula of the compound?
a. C14H10N6O12
b. C5H7N3O6
c. C7H5N3O6
d. C9H7N2O4