Final answer:
0.25 mol of copper atoms would have the same mass as 15.885 grams, as found by multiplying the number of moles by the atomic mass of copper (63.54 g/mol).
Step-by-step explanation:
The mass that would have the same mass as 0.25 mol of copper atoms can be determined using the atomic mass of copper and Avogadro's number. The atomic mass of a copper atom is 63.54 grams per mole, therefore, to find the mass of 0.25 mol of copper atoms, we multiply 0.25 mol by the atomic mass of copper.
We perform the following calculation:
0.25 mol × 63.54 g/mol = 15.885 grams
Thus, 0.25 mol of copper atoms has a mass of 15.885 grams. This means that anything with the mass of 15.885 grams would have the same mass as 0.25 mol of copper atoms.