10grams of salt (Nacl) is added to 100ml of water. What are the freezing and boiling points.(kb =0.51kg/mol) ( kf =1.86°ckg/mol)

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?