Excess water and impurities. Option A.
Under what conditions can one get over a 100% yield?
In the actual sense of it, no chemical reaction can give over a 100% yield. The upper limit cannot be breached. Thus, if more than a 100% yield is obtained, there is a problem somewhere.
One of the problems could be that the product is not sufficiently dried. In other words, excess water has contributed to the yield of the reaction.
The second likely problem could be that at some points during the reaction, impurities have been introduced. The weight of the impurities will add to the actual yield and give a bogus over a 100% yield.
More on percent yield can be found here: https://brainly.com/question/17042787
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