Question

The element uranium ( U ) has three naturally occuring isotopes, U234 , U235 , and U238 . U234 has an isotopic mass of 234.04 u and a relative abundance of 0.0054%. U235 has an isotopic mass of 235.04 u and a relative abundance of 0.7204%. U238 has an isotopic mass of 238.051 u and a relative abundance of 99.2742%. Calculate the average atomic mass of uranium.

Answer 1

`m_U=238.03u`

Step-by-step explanation:

Hello,

In this case, since the average atomic mass for the given element is computed by taking into account the mass of each isotope and their abundance, we proceed as follows:

`m_U=234.04u*0.0054\%+235.04u*0.7204\%+238.051u*99.2742\%\\\\m_U=0.01264+1.69323+236.3232\\\\m_U=238.03u`

Best regards.