The average atomic mass of Rubidium is 86.09 amu.
According to the question,
Abundance of Rubidium-86 = 73.2%
Abundance of Rubidium-87 = 26.7%
Steps to calculate the average atomic mass of an element are:
- Their percentage abundances are divided by hundred to obtain a decimal value.
- The obtained value of each isotope is multiplied by its atomic mass.
- All the isotopic values are added.
Therefore,
Rb-86 = 73.2/100 = 0.732
Rb-87 = 26.7/100 = 0.267
Atomic mass of Rb-86 = 0.732 × 85.91 = 62.89 amu
Atomic mass of Rb-87 = 0.267 × 86.91 = 23.20 amu
Hence, the average atomic mass = 62.89 amu + 23.20 amu = 86.09 amu.
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