Aballoon is filled with 0.250 mole of air at 35â°c. if the volume of the balloon is 6.23 liters, what is the absolute pressure of the air in the balloon?

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?

What is the most common form of matter in the universe

Express your answer using two significant figures. 1.7 km^2