Final answer:
The mass of 3.0 moles of copper is found by multiplying the atomic mass of copper (63.55 g/mol) by the number of moles, giving a mass of 190.65 grams. The closest answer choice is D, which is 192.15 grams.
Step-by-step explanation:
To calculate the mass of 3.0 moles of copper, we use the atomic mass of copper and multiply it by the number of moles. The atomic mass of copper is approximately 63.55 grams per mole. Therefore, for 3.0 moles, the calculation would be as follows:
Mass = Atomic mass of copper × Number of moles
Mass = 63.55 g/mol × 3.0 moles
Mass = 190.65 grams
The closest answer to 190.65 grams is 192.15 grams, which is option D.