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:
[tex]\text{Average percent yield = }\frac{(\text{percent yield for trial \#1)+(percent yield for trial \#2)}}{\text{number of trials}}[/tex]
Thus, we can calculate the average percent yield as:
[tex]\text{average percent yield = }\frac{(99.15)+(99.04)}{2}=99.10\%[/tex]
Therefore, the average percent yield for the two trials is 99.10%
