Aqueous lead nitrare is combined with aqueous potassium chromate to form soild lead chromate and potassim nitrate is solution. If 25.0 grams of each recant is used, what is the percent yield of lead chromate if 20.0 grams of PbCrO4 is collected ? K2CrO4 + Pb(NO3)2 - 2KNO3 answer choices
58.8%
66.6%
69.0%
81.5%

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?