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It is not possible due to the Law of Conservation of Matter/Mass. In a reaction, mass does not suddenly disappear or appear such as when liquid water evaporates, the water is still there just in a gaseous form. Thus, reactants totaling a mass of 12 grams will form products that total 12 grams - no less and no more.
So Andre's answer is correct, in theory. To your question, Ames, no, 14 g of product cannot be formed. HOWEVER, 12 g of product will not always be formed in the reaction. Firstly, the reactants may or may not completely react with one other (limiting reactants). Secondly, because of side reactions and other factors, 12 g of expected product may not necessarily be formed. You may have less, in which case you'll want to look at % yield (which is how much you get divided by how much you expected. Just a side note to keep in mind for later on.
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