What is the reference isotope to calculate relative atomic mass, Ar?
Question
What is the reference isotope to calculate relative atomic mass, Ar?
Solution
The reference isotope for calculating relative atomic mass (Ar) is Carbon-12. This isotope of carbon has been chosen as the standard reference by the International Union of Pure and Applied Chemistry (IUPAC). The relative atomic mass of an element is calculated as a weighted average of the atomic masses of the different isotopes of that element, compared with the atomic mass of Carbon-12.
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The average atomic mass of Re is 186.207 amu. It is calculated from the two naturally occurring isotopes 185Re and 187Re. If the isotopic abundance of 185Re is 37.4% and the isotopic mass of 185Re is 184.953 amu calculate the mass of 187Re.Group of answer choices
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