Calculate the average atomic mass of rubidium. Rubidium has two naturally isotop

Question

Calculate the average atomic mass of rubidium. Rubidium has two naturally isotopes rubidium-85 (atomic mass =84.91118 amu; abundance =72.15%) and rubidium-87 (atomic mass 86.9092 amu; abundance= 27.85%) Express your answer using four significant figures. Calculate the average atomic mass of rubidium. Rubidium has two naturally isotopes rubidium-85 (atomic mass =84.91118 amu; abundance =72.15%) and rubidium-87 (atomic mass 86.9092 amu; abundance= 27.85%) Express your answer using four significant figures. Express your answer using four significant figures.

Explanation / Answer

ANSWER

The average atomic mass of an element = (mass of iotope 1 X abundance) + (mass of isotope 2 X abundance) + .....

Average atomic mass of Rubidium = (84.91118 X 0.7215) + (86..9092 X 0.2785) = 61.26 + 24.20 = 85.46

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