How many fluorine atoms are present in 125.0g of phosphorus pentafluoride?

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This drawing shows a human body system. what is the primary function of this body system?

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?