How many moles are in 1.2 x 103 grams of ammonia, nh3?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

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?