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# Element X-100 and X-104 the atomic mass of X is 101 amu. What is the relative abundance of each isotope in nature?

The abundance of X-100 is 75 percent, and X-104 has an abundance of25 percent. The answers are found by solving two equations with twounknowns, which are A plus B equals 100, …and 100A plus 104B equals10,100. (MORE)