When salt dissolves in water, it seems to disappear. What happens to the salt that makes it no longer visible?
A.
The salt becomes a gas that is invisible to the naked eye.
B.
Crystals of salt float to the top of the water where they cannot be seen.
C.
The particles of the salt separate from each other and become surrounded by water molecules.
D.
The particles of the salt stay close together at the bottom of the water, but they are in liquid form.

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 .