The percent composition of each element can be calculated as follows: % composition = (mass of element / total mass) * 100
The total mass of the quarter is given to be 5.670 grams Mass of Cu = 5.198 grams Mass of Ni = 0.472 grams
Substitute in the above equation to get the mass percentage of each element as follows: % of Cu = (5.198/5.670) * 100 = 91.675% % of Ni = (0.472/5.670) * 100 = 8.325%
