NO, is a toxic gas that forms acid rain when mixed with water in the air. The major source of NO, is the combustion of , (g) in the cylinders of automobile engines. How many metric tons (1 * 10 grams) of NO, are produced when
50 X 10L of N, react with excess oxygen in the auto engines in a city? Assume 25°C and 1.00 atm pressure.
(Write a balanced equation.)

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?