Q.1 ) A sample of unknown organic compound contains C. H. O and N. Combustion of 2.18g sample in excess ess oxygen yields 3.94 g CO , and 1.89 g of H , 0. A separate experiment shows that 1.23 g unknown sample contains 0.235 g nitrogen . What is the empirical formula of the compound ?

Many radioactive atoms that have large masses undergo radioactive decay by releasing a particle that is identical to a helium-4 nucleus. what changes in the original atom are expected as a result of this natural phenomenon? the atomic number and the mass number will decrease. the atomic number and the mass number will increase. the atomic number will increase, and the mass number will decrease. the atomic number will decrease, and the mass number will increase.