Question

The element Eu occurs naturally as a mixture of 47.82% 152Eu, whose mass is 150.9 amu and

52.18% 153Eu, whose mass is 152.9 amu. Calculate the average atomic mass of Eu.
A.15.194 amu
B.151.94 amu
C.1519.4 amu
D.15194 amu

Answer 1

M = 151.94 amu

Step-by-step explanation:

It is given that,

The element Eu occurs naturally as a mixture of 47.82% 152 Eu, whose mass is 150.9 amu and 52.18% 153 Eu, whose mass is 152.9 amu. We need to find the average atomic mass of Eu. It can be calculated as follows :

`M=47.82\%\ \text{of}\ 150.9+52.18\%\ \text{of}\ 152.9\\\\M=(47.82)/(100)\cdot150.9+(52.18)/(100)\cdot152.9\\\\M=151.94\ \text{amu}`

So, the average atomic mass of Eu is 151.94 amu.