The purpose of this lab was to synthesize various copper compounds from metallic compounds and then recover all the initial copper back as pure metallic copper. After the pure solid copper was recovered, the objective was to calculate the percentage yield using the mass of the recovered copper and the initial mass of the pure solid copper. In this case, the percentage yield was about 220% which is higher than the highest possible yield of 100%. This results point to one explanation which was that the final sample was not dry and that all the water did not evaporate. The water that did not evaporate increased the mass of the final sample which is why the percentage yield was greater than the initial mass of the pure solid copper. To avoid such
