Calculate the relative atomic mass of this sample of Germanium, giving your answer to two decimal places ...

The relative atomic mass of the sample of Germanium is 72.89 u

Explanation:

For a sample of germanium we have the following compositions:

m70Ge = 70 u

%70Ge = 22.6%

m72Ge = 72 u

%72Ge = 25.45%

m74Ge = 74 u

%74Ge = 36.73%

m76Ge = 76 u

%76Ge = 15.22%

To calculate the atomic mass of Germanium we must add all the atomic masses of its isotopes multiplied by its percentage of abundance and all this divided by 100, in this way:

mGe = [ (m70Gex%70Ge) + (m72Gex%72Ge) + (m74Gex%74Ge) + (m76Gex%76Ge) ]/100

replacing values:

mGe = [ (70x22.6) + (72x25.45) + (74x36.73) + (76x15.22) ]/100 = 72.89 u

Germanium is an element in the same group with Carbon and Silicon. The atomic number is 32. The relative atomic mass is usually measured with the Sample of an isotope. In this case Germanium has a relative atomic mass of 72.63