Jane is trying to find out how many molecules are in a sample containing 5.1 moles of salt. What formula should she use to find out?

Which element is least likely to undergo a chemical reaction

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?

Determine type of reaction & predict the product c3h12+o2 =