A mixture is known to contain mercury (II) oxide. A 4.85 gram sample of the mixture is heated, decomposing the mercury (II) oxide, and 254 mL of oxygen gas are collected at 32.0C and 735.0 torr. What is the percentage of mercury (II) oxide in the mixture? Box 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?

How are the terms group and period used on the periodic table

Which of these is an intensive property of a substance