20) Pythagorean Theorem A foot ladder rests against and reaches the top of a brick wall. The foot of the ladder is 4 feet away fro
the base of the wall. If the wall is 12 feet tall, how long is the ladder? Rourid to the nearest tenth of a
foot.
A. 11.3 feet
B. 12.6 feet
C. 16.0 feet
D. 74.0 feet

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 .