Day 3 of the lab.
Today we finished weighing the mass of the jar and copper and calculated the % yield to determine the charge of the Iron. First we subtracted the original mass to the new mass of the nail after the reaction and did the same with the copper (jar+copper-jar mass) to get how much copper was left. We then converted the mass of the iron into copper to get the theoretical yield which was over 100%, if the iron was a 2+ charge, and a little over 70% if calculated at 3+ leading us to believe that the Fe was a 3+.
Here's some more information on finding the theoretical yield. Tripod
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