## Chemistry and Chemical Reactivity (9th Edition)

Their abundances are $60.12\%$ and $39.88\%$, respectively.
Gallium's atomic weight is 69.723: $68.9257\times x+70.9249\times(1-x)=69.723$ solving for x: $x=0.6012$ Their abundances are $60.12\%$ and $39.88\%$, respectively.