Atomic mass of an element is 32.064u.
One isotope has abundance of 95.018% and has atomic mass 31.971u.
The other isotope has abundance of 4.982 and let its atomic mass be x.
Now,
"(95.018\u00d731.971 + x\u00d74.982)\/100 = 32.064"
"3037.82048 + 4.982x = 3206.4"
"x=(3206.4-3037.82048)\/4.982"
"x=33.8377198(Answer)"
The mass number of other isotope is 33.8377198u
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