Question

Copper has two naturally occurring isotopes and an atomic mass of 63.546 amu. cu-63 has a mass of 62.940 amu and an abundance of 69.17%. what is the identity and percent abundance of copper's other isotope? (type your answer for identity using the format cl-35 for chlorine-35.)

Answer 1

The percent abundance of copper's other isotope is 30.83%.

Step-by-step explanation:

The identity of the other isotope of copper can be determined by subtracting the abundance of cu-63 (69.17%) from 100% (the total abundance). The abundance of the other isotope is therefore 100% - 69.17% = 30.83%. Now, to find the percent abundance, we divide the abundance of the other isotope by the total abundance and multiply by 100%. So, the percent abundance of copper's other isotope is (30.83% / 100%) * 100% = 30.83%.

Answer 2

The average atomic mass of copper = 63.546 amu

Copper has two natural isotopes.

The % abundance of the first isotope Cu-63 is 69.17 %

Mass of the isotope Cu-63 = 62.940 amu

The percentage abundance of other isotope will be 100 - 69.17 % = 30.83 %

Let the atomic mass of other isotope be x amu

Average atomic mass is the weighted average of the atomic masses of all isotopes of an element.

`63.546 amu = 62.940 amu (0.6917) + x (0.3083)`

x = 64.90 amu

The atomic mass of other isotope of copper is 64.90 amu

Therefore, the isotope will be Cu-65