Question

Calculate the atomic mass of gallium (ga). gallium has two isotopes: 69 ga and 71 ga. 69 ga has a relative abundance of 60.12% and an atomic mass of 68.9257 amu. 71 ga has a relative abundance of 39.88% and an atomic mass of 70.9249 amu. show all your work.

Answer 1

The atomic mass of gallium is approximately 69.7701 amu.

Step-by-step explanation:

To calculate the atomic mass of gallium (Ga), we need to use the formula:

Atomic mass = (Mass of isotope 1 × Relative abundance 1) + (Mass of isotope 2 × Relative abundance 2)

Inserting the values:

Atomic mass = (68.9257 amu × 0.6012) + (70.9249 amu × 0.3988)

Calculating:

Atomic mass ≈ 41.4873 amu + 28.2828 amu ≈ 69.7701 amu

Therefore, the average atomic mass of gallium is approximately 69.7701 amu.