Data Trial 1 Trial 2
Mass of empty crucible with lid 26.696 g 26.679 g
Mass of Mg metal, crucible, and lid 27.011 g 27.084
Mass of MgO, crucible, and lid 27.215 g 27.349 g
Calculations:
Show your calculations for each of the following. Remember, calculations should follow rules for significant figures.
1. Write the balanced chemical equation for the reaction you are performing.
2Mg + O2 -> 2MgO
2. Subtract the mass of the crucible and lid (row 1 in the chart) from the total mass of Mg, crucible, and lid (row 2 in the chart) to find the mass of magnesium for each trial.
• Trial 1: 0.315
• Trial 2: 0.404
3. Subtract the mass of the crucible and lid (row 1 in the chart) from the total mass of MgO, crucible, and lid (row 3 in the chart) to find the mass of magnesium oxide for each trial. This is the actual yield of magnesium oxide for each trial.
• Trial 1: 0.519
• Trial 2: 0.67
4. Magnesium is the limiting reactant in this experiment. Calculate the theoretical yield of MgO for each trial.
• Trial 1:
• Trial 2:
5. Determine the percent yield of MgO for your experiment for each trial.
• Trial 1:
• Trial 2:
6. Determine the average percent yield of MgO for the two trials.
