How is it determined the highest energy level an atom has A. By the group number
B. By the period number
C. By the atomic number
D. By the mass number

How have the greenhouse gasses increased from the year 2000 to 2018

Find the number of moles of argon in 364g of argon.

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 .