Can anyone help me with this one please 20 SolutionStep 1 Co

Solution

Step 1:  Convert the percent natural abundances into decimal form by dividing by 100.

Fraction Ga-69= 60.11/100=0.6011

Fraction Ga-71=39.89/100=0.3989

Step: 2 Use the fractional abdundances and the atomic masses of the isotope to compute the atomic mass

Atomic mass =(0.6011 x 68.9256 amu) + (0.3989 x 70.9247) = 41.4321 amu + 28.2919 amu = 69.7231

four significant figures 69.72 amu are needed