Cabon tetrachloride boils at 23.0°C when the applied pressure is 100. mmHg and at 57.8°C when the applied pressure is 400. mmHg. What will the vapor pressure of carbon tetrachloride when the temperature is 15.0°C

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?