The two abundant isoptopes of rubidium are 87 Rb and 85 Rb. The weighted average

Question

The two abundant isoptopes of rubidium are 87Rb and85Rb. The weighted average atomic mass of a Rb atom is85.4678 amu. Select the correct statement. A. The fractional abundance of each isotope is 0.50. B. 87Rb is the predominant isotope. C. 85Rb is the predominant isotope. D. There is insufficient information to answer thisquestion. The two abundant isoptopes of rubidium are 87Rb and85Rb. The weighted average atomic mass of a Rb atom is85.4678 amu. Select the correct statement. A. The fractional abundance of each isotope is 0.50. B. 87Rb is the predominant isotope. C. 85Rb is the predominant isotope. D. There is insufficient information to answer thisquestion.

Explanation / Answer

C ... the average mass is much closer to 85 than it is87 average mass is a sum of products of the isotope's mass andits relative abundance (the percentage of the element is thatisotope) 85(X%) + 87(Y%) = 85.4678 which is no where close to the 50-50average of 86

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