What is the percent yield of potassium chloride if potassium reacts with excess chlorine gas to produce 10.3 grams of potassium chloride, but the theoretical yield is 12.9 grams?
a. 33.2%
b. 52.4%
c. 79.8%
d. 95.3%

The percent yield of the reaction is equal to actual yield / theoretical yield * 100%. So for this question, the percent yield is 10.3/12.9*100%=79.8%. So the answer is c.

The answer is (3) esterification. Note that deposition, distillation and sublimation are not chemical changes, they are physical changes, so you can solve this question by elimination if you know that. Regarding sterification it is a well known chemical reaction that consists on the formation of esters from carboxilic acids.