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Semmy
[17]
3 years ago
6
Gallium has two naturally occurring isotopes with the following masses and natural abundances: Isotope Mass ( amu ) Abundance (%
) Ga−69 68.92558 60.108 Ga−71 70.92470 39.892. calculate the atomic mass of gallium
Chemistry
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ICE Princess25
[194]
3 years ago
4
0
The formula for determination of atomic mass given the mass of isotopes and relative abundance is:
Ar = ∑(mass * abundance) / 100
Ar = (68.92558 * 60.108 + 70.92470 * 39.892) / 100
Ar = 69.72306
The atomic mass of gallium is 69.72306 amu
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