Answer:
Step-by-step explanation:
Theoretical is 10.3 grams. Actual yield of 9.8 grams can be compared to the theoretical 10.3 grams with (Actual/Theoretical)*(100%) to give percent theoretical yield.
(9.8g/10.3g)*(100%) = 91.5% theoretical yield.
Hint: Suggest it was because your lab partner was sloppy.