Practice Exercise. Gallium (Z = 31) has only two naturally occurring isotopes: 6Ga with a mass...

Question

Question

Answer 1

Answer #1

Atomic mass of Ga = 69.723 amu

Given:

m1 = 68.9256 amu

m2 = 70.9247 amu

m = 69.723 amu

use:

atomic mass = sum of (mass of isotope * abundance) / 100

m = (m1*A1 + m2*A2)/100

69.723 = ( 68.9256*A1 + 70.9247*(100-A1))/100

69.723 = ( 68.9256*A1 + 7092.47- 70.9247*A1))/100

A1 = 60.0 %

A2 = 100 - A1

= 100 - 60.0

= 40.0 %

Answer: 60.0 % and 40.0 %

Answer 2

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