A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of a 2.18 g sample burns in excess oxygen yields 3.94 g of CO2 and 1.89 g of H2O. A separate experiment shows that a 1.23 g sample contains 0.235 g of N.

Calculate the moles of C in the sample.

Calculate the moles of H in the sample.

Calculate the moles of N for a 2.18 g sample (the sample size for the other analyses).

Calculate the moles of O in the sample.

and finally Determine the empirical formula. How many moles of H are in the empirical formula?