A compound C, H,Oz is found to be 71.95% by-mass carbon, 12.08% by-mass hydrogen, and 15.97% by-mass oxygen. A separate experiment shows that the
molecular weight of C, H,O2 is 300.5 g/mol. Determine the molecular formula of the
compound (i. e., determine the values of the subscripts x, y, and z).

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?