The question requires us to obtain the average percent yield of MgO, given the yield calculated for two different trials.
The percent yield of a process can be obtained by dividing the amount of product obtained by the amount expected, and then multiplying this value by 100%.
The average percent yield can be calculated considering the yield values obtained for each trial, as given by the following equation:
Thus, we can calculate the average percent yield as:
Therefore, the average percent yield for the two trials is 99.10%