A solution was made by dissolving 1.77 g Ba(OH)2 in 100. mL final volume. (Note: For the purpose of significant figures, assume Kw = 1.00 x 10-14) (a) What is the molar concentration of OH- in the solution?

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?