Question

Natural samples of copper contain two isotopes. 63Cu has a mass of 62.930 amu and 65Cu has a mass of 64.928 amu. The percent abundance of 63Cu is 69.09% and 65Cu is 30.91%. Calculate the average atomic mass of copper.

Answer 1

The average atomic mass of copper can be calculated by multiplying each isotope's mass by its respective percent abundance and summing the results. For copper, we have: 63Cu: 62.930 amu * 0.6909 = 43.43 amu 65Cu: The average atomic mass of copper is 63.46 amu.

Step-by-step explanation:

The average atomic mass of copper can be calculated by multiplying each isotope's mass by its respective percent abundance and summing the results. For copper, we have: 63Cu: 62.930 amu * 0.6909 = 43.43 amu 65Cu: 64.928 amu * 0.3091 = 20.03 amu Adding these two values together gives us: 43.43 amu + 20.03 amu = 63.46 amu Therefore, the average atomic mass of copper is 63.46 amu.

average atomic mass of copper can be calculated by multiplying each isotope's mass by its respective percent abundance and summing the results. For copper, we have: 63Cu: 62.930 amu * 0.6909 = 43.43 amu 65Cu: The average atomic mass of copper is 63.46 amu.