Question

Copper exists in nature as two isotopes. The atomic masses and relative abundance of these isotopes is given in the table. What is the average atomic mass of copper?

Answer 1

The correct answer should be B) 63.55. That's because the most precise number is 63.546, but you would write 55 because 46 is rounded that way in the equation. The others are a bit higher, while E is a completely different element, Iodine. This isn't the most precise piece of data because in reality there would be a slight differentiation of +- 0,003u