Which of the following is true about how hydrogen and oxygen can combine to form molecules? A. Hydrogen and oxygen can combine in many ways to form different molecules.
B. Two atoms of hydrogen are always required to bond with two atoms of oxygen.
C. When oxygen combines with hydrogen to make a molecule, water will always be produced.
D. Molecules composed of hydrogen and oxygen must have at least four atoms

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 .