1. (04.01 LC) Based on the law of conservation of mass, which of the following statements is correct? (5 points)
O Matter is neither created nor destroyed.
O Matter can be created butit cannot be destroyed.
O The total mass of substances before a reaction is less than the total mass after a reaction,
O The total mass of substances before a reaction is greater than the total mass after a reaction.

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 .