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:
• trial 2:

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:
• 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.

data trial 1 trial 2
mass of empty crucible with lid 26.680g 26.694
mass of mg metal, crucible, and lid 27.001g 27.113g
mass of mgo, crucible, and lid 27.206 27.397g