Question

1. use the following data to calculate the atomic mass of gallium. show all work.

isotope	abundance (%)	mass (amu)
^71ga	39.892	70.925

Explanation:

Step1: Convert percentage abundances to decimals

For $^{69}$Ga, the abundance in decimal is $60.108\div100 = 0.60108$. Multiply it by its mass: $0.60108\times68.926=41.424$.

Step2: Convert percentage abundances to decimals for $^{71}$Ga

For $^{71}$Ga, the abundance in decimal is $39.892\div100 = 0.39892$. Multiply it by its mass: $0.39892\times70.925 = 28.293$.

Step3: Calculate the atomic mass

Add the two products together: $41.424 + 28.293=69.717$.

Answer:

$69.717$ amu