Data
Trial 1 | Trial 2
Mass of empty crucible with lid |
26.696 g | 26.685 g
Length of ribbon cut |
2 in. | 1 in.
Mass of Mg metal, crucible, and lid |
27.002 g | 26.953 g
Mass of MgO, crucible, and lid |
27.195 g | 27.122 g

Calculations
Show your calculations for each of the following. Remember, calculations should follow rules for significant figures.

Remember to use the balanced chemical reaction: 2Mg(s) + O2(g) → 2MgO(s).

Subtract the mass of the crucible and lid (row 1 in the chart) from the total mass of Mg, crucible, and lid (row 3 in the chart) to find the mass of magnesium for each trial.
Trial 1:

Trial 2:

Subtract the mass of the crucible and lid (row 1 in the chart) from the total mass of MgO, crucible, and lid (row 4 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:

Magnesium is the limiting reactant in this experiment. Calculate the theoretical yield of MgO for each trial using stoichiometry.
Trial 1:

Trial 2:

Determine the percent yield of MgO for your experiment for each trial.
Trial 1:

Trial 2:
Determine the average percent yield of MgO for the two trials.