Basically you are trying to work out how much aspirin that could be made from 2.00 g of salicylic
acid. this means that you have to divide 180 by 138 and this will give you the amount for one gram but you need to calculate it for two grams so you multiply the answer by two. you should get 2.61 as your final answer
part B is about percentage yield. The question gives you the actual value and you have calculated the predicted/theoretical in part A. so divide 1.1 by 2.61 and then multiply it by 100 because it is a percentage.