Carbonates react with acids in order to form salt, water, snd carbon dioxide gas. when 50.0 grams of calcium carbonate are reacted with sufficient hydrochloric acid, how many grams of calcium chloride will be produced? (write a balanced equation first)

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

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?