Adescription of an observed
phenomenon that holds true every time
it's tested under a given set of conditions
a collective human effort to
comprehend, or better understand, the
history of the natural world and how it
works, through physical evidence
collected via observations
a proposed explanation for a
narrow set of phenomena
a scientific explanation formulated
based on known facts and repeated
testing

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 .