Respuesta :
The amu of the other isotope is 70.925amu .
Given,
Atomic mass of Gallium = 69.723amu
Let us consider the two isotopes of gallium is A1 and A2.
Given, the mass of isotope of gallium = A1
= 68.926amu
The percentage abundance of isotope (A1)
= 60.11% = 0.6011
Let us consider,
The total percentage abundance is 100% .
Now, the percentage abundance of isotope (A2)
= 100% - 60.11% = 39.89% = 0.3989
Acc to rule of percentage abundance,
amu of isotope 1 (A1) × fraction of A1 + amu of isotope 2 (A2) × fraction of A2 = amu of mixture ×1
68.926 amu × 0.6011 + A2 × 0.3989 = 69.723 ×1
41.431 + A2 × 0.3989 = 69.723
A2 × 0.3989 = 69.723 - 41.431
A2× 0.3989 = 28.292
A2 = 28.292/ 0.3989
A2 = 70.925 amu
Hence, the amu of the other isotope is 70.925amu .
Isotope :
These are the atoms of same element having same atomic number but different atomic mass number.
These are elements having same chemical property but differ in physical property.
Learn more about isotope here :
brainly.com/question/364529
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