Chem molarity help pls! 20 points! ( 3 questions )
1. A 25.0 mL sample of concentrated HCl (12.0 M) is diluted to a final volume of 750.0 mL. Calculate the molarity of the final solution.

2. Calculate the volume (mL) of concentrated HNO3 (15.8 M) that should be used to prepare 250.0 mL of a 0.400 M solution.

3. Calculate the volume of water (in mL) that must be added to 150 mL of 0.600 M HCl solution to give a 0.450 M HCl 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 .