CHEM403 Lecture Notes - Lecture 3: Reagent, Chemical Formula
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Individual portion: no, my observations do not support that mass is conserved in a chemical reaction. When i weighed the zinc out in the beginning of the lab before the reaction it weighed 1. 697 grams and after the reaction it decreased to . 919 grams. 0259519804 mol x 65. 39 g = 1. 697 = theoretical yeild: actual yield= . 919 grams. 919 grams / 1. 697 = . 541543901 x 100 = 54. 15% Some possible causes for the deviation from a 100% yield include an incomplete reaction, possible side reactions, some product could also be lost when we were decanting the solution or rinsing with methanol. The deviation from a hundred percent yield could include an incomplete reaction of the zinc and iodine which could result in less reacted zinc. It is also possible to lose some of my product during evaporation, small spill of the solution or trace amounts of the reactant left in the containers when transferring.
