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Answers:The only other possibility is that your sample of Phenyl Benzoate isn't totally pure and may still contains some reactant.
Answers:Experimentally, Getting more then a 100% yield is nearly always a result of not drying the product properly, thus you are weighing solvent + product, thus increasing you mass. Another possiblity can be if you have not purified your product completely and there are some excess reagents still present in the product. Or you wrote some numbers down incorrectly when weighing. Computationally, Did you balance the equation correctly and determine the correct theoretical yield.
Answers:IT MOST CERTAINLY CAN!!!! It actually is possible to obtain an actual yield higher than your theoretical yield. One particular experiment comes to mind in which this happened was due to an excess of zinc in the mixture, but I don't recall what the exact experiment was. Suffice to say that it is possible. However, I agree with rest of the answers that 999 times out of 1000, you will not have a percent yield higher than 100 and there is likely an error in your calculation.
Answers:you would have to expect that with all the billions upon billions upon billions of molecules and atoms involved in even a small sample reaction that some of them may miss out on the action even more likely is that at least some of the products will break back down to reactants this is summarized for a particular reaction under particular circumstances as percent yield