Question

a new element, uranium (ubm), is discovered with an atomic number of 120. there are 3 isotopes of ubm: ubm-312 with a relative abundance of 37.26%, ubm-313 with a relative abundance of 2.79%, and ubm-315 with a relative abundance of 59.95%. what is the average atomic mass of uranium?

Answer 1

The average atomic mass of uranium = 313.826 amu

What is average atomic mass ?

The weighted average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight. Unified atomic mass units (u), where 1 u is equal to precisely one-twelfth the mass of a neutral atom of carbon-12, are the standard units used to express average masses.

average atomic mass = $( 312*37.26 + 313*2.79 + 315*59.95 )/100 = 313.826 amu$

average atomic mass of uranium = 313.826 amu

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