A scientist wants to produce 14.5 L of nitrogen dioxide at 300 K and 1.75 atm using nitrogen gas and oxygen gas. How many liters of EACH gas is required? (Use the correct number of significant figures in your answer.)

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?