Which equivalence factor should you use to convert from 38.2 grams of potassium (k) to moles of potassium? (38.2 g k/39.10 g k) (38.2 g k/1 mol k) (1 mol k/38.2 g k) (1 mol k)/39.10 g k)

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?