Hello, I need to find the % of copper and zinc of both pennies. I did the second one but don't know if it is correct.

Calculation Calculation Final Observations 1: % of 2: % Zinc Observations Initial Mass after filing Year of Mint During/After copper (see (see Mass (g) after but before HCl(g) calculations calculations HCI HCI for help) for help) When the experimenter The penny is put the 1981 notched on penny in the its edges and HCI, the HCI Pre-1982 3.05g 3.066g it's from starts to turn penny 1981. It has yellow. In the a brown end, the color penny lost some of its colors. When the experimenter put the 2014 penny in the HCl it starts to bubble. The HCI seems that it The penny is creating a notched on sort of its edges and Post-1982 steam. In the 2.531g 0.063g 2.5% 97.51% it's from penny end, the 201 It is