The volume of a sample of pure hcl gas was 189 ml at 25°c and 108 mmhg. it was completely dissolved in about 60 ml of water and titrated with an naoh solution; 15.7 ml of the naoh solution were required to neutralize the hcl. calculate the molarity of the naoh solution.

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 .