How many grams of product are made when 42.7 g of nitrogen gas and 70.6 g of oxygen gas are bubbled into excess water according to the equation below? 2 N2(g) + 5 O2(g) + 2 H2O(l) → 4 HNO3(aq)

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?