Question

30kg of nitrogen and 10kg of hydrogen are mixed to produce ammonia. Calculate the ammonia formed?

Answer 1

the law of conservation of mass states that during any chemical reaction the amount of substance formed is equal to the total mass of reactant
30kg of nitrogen +10kg of hydrogen =40kg of ammonium is formed

Answer 2

nitrogen = 30 kg
hydrogen = 10 kg

according to law of conservation of mass,
ammonia = (30 + 10) kg = 40kg