To find the percent yield, you need to divide the actual yield of 112.9 grams by the theoretical yield of 137.5 grams, and then multiply by 100:
Percent yield = (actual yield / theoretical yield) * 100
Percent yield = (112.9 / 137.5) * 100
Percent yield = 82.0%
So the percent yield of the reaction is 82.0%.