Answer:
M = 151.94 amu
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 :
[tex]M=47.82\%\ \text{of}\ 150.9+52.18\%\ \text{of}\ 152.9\\\\M=\dfrac{47.82}{100}\cdot150.9+\dfrac{52.18}{100}\cdot152.9\\\\M=151.94\ \text{amu}[/tex]
So, the average atomic mass of Eu is 151.94 amu.
