Question

Copper has two isotopes, copper-63 (62.9296 amu) and copper-65 (64.9278 amu). if the relative abundance of copper-63 is 69.1%, calculate the average atomic mass of copper.

Answer 1

The average atomic mass of copper can be calculated by considering the relative abundance and the atomic masses of its isotopes.

Step-by-step explanation:

The average atomic mass of copper can be calculated by considering the relative abundance and the atomic masses of its two isotopes: copper-63 and copper-65. Given that the relative abundance of copper-63 is 69.1%, we can calculate the average atomic mass using the formula:

Average Atomic Mass = (Relative Abundance of copper-63 * Atomic Mass of copper-63) + (Relative Abundance of copper-65 * Atomic Mass of copper-65)

Plugging in the values:

Average Atomic Mass = (0.691 * 62.9296 amu) + (0.309 * 64.9278 amu) = 63.546 amu