Nitrogen fixation occurs when which of the following happens? O Bacteria absorb nitrogen and release it as carbon dioxide.
Bacteria convert nitrogen to a form that plants can use.
O Plants absorb the nitrogen from both the soil and the air.
O Plants break down the nitrogen and use it as a nourishing sugar.

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 .