A hypothetical element X is found to have an atomic mass of 37.45 amu. Element X has only two isotopes, X-37 and X-38. The X-37 isotope has a fractional abundance of 0.7721 and an isotopic mass of 37.24. What is the isotopic mass of the other isotope?

The isotopic mass of the other isotope is 38.16 amu

Explanation:

Mass of isotope X-37 = 37.24

fractional abundance of isotope X-37  = 0.7721

Mass of isotope X-38 = ?

fractional abundance of isotope X-38 = (1-0.7721)= 0.2279

Formula used for average atomic mass of an element :

Therefore, the isotopic mass of the other isotope is 38.16 amu

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the answer is 303.15 or 303