The moles in 196.5 grams of zn(no3)2

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

Which statement best describes what happens when molecular compounds melt

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?