Page CHM-201 Lab 3 Empirical Formula MgO (Rev 205-19) Questions: 1. This experiment depends on the accuracy of the masses used. Give at least one reason why the mass could be expected. Which of these cases do you think best represents your results? (6 points) 2. Write balanced chemical equations for the following reactions (you will need to review the information provided in the introduction to this laboratory for the formulas involved; remember that oxygen is 02 and nitrogen is N2): (9 points) a. The reaction of magnesium with nitrogen. b. The reaction of magnesium nitride with water c. The reaction of magnesium hydroxide when heated CHM-201 Lab 3 Empirical Formula MgO (Rev 205-19) Page 7 of 7 3. What mass would be the predicted mass of the final oxide if you reacted 0.2772 grams of barium in place of magnesium in this experiment?. (7 points) 4. What is the emprical formula of a substance that contains only carbon, hydrogen, oxygen and nitrogen if the mass-mass percentage of the following elements was determined experimentally: 49.98 % C; 5.19 % H and 28.82 % N. (8 points)