Mrs. smith wrote down a chemical equation on the board and stated that mass is conserved in the reaction. what did she mean? the number of atoms on each side changes. there are more atoms on the product side. there are more atoms on the reaction side. there are equal numbers of atoms on both sides. 99 points

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 .