With the help of table 4.1, find mass number (atomic mass) of oxygen and sulpur atom?

Consider this initial-rate data at a certain temperature for the reaction described by

Chemistry worksheet - i am not sure what they are asking for exactly?

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?