Help cococococo cococococo doing this for the points or whatever it is cococo

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .