In the fictitious city of Metropolis, Superman is located at 3rd Street and 3rd Avenue while Lois Lane is located north and east of Superman at 9th Street and 12th Avenue.
a. How many blocks would Lois Lane have to walk to reach Superman?
b. How far would Superman have to fly to reach Lois Lane?
c. In what direction should Superman fly to reach Lois Lane as quickly as possible?

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 .