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What is the average atomic mass of strontium?

Naturally occurring strontium consists of four isotopes: Sr-84, Sr-86, Sr-87, and Sr-88. Below is the data concerning their natural abundances:

A. Sr-84: 0.56%
B. Sr-86: 9.86%
C. Sr-87: 7.00%
D. Sr-88: 82.58%

Answer :

Final answer:

The average atomic mass of strontium is calculated by taking the sum of the product of the atomic mass of each isotope and its respective natural abundance. The calculation gives the average atomic mass of strontium as approximately 87.62 atomic mass units.

Explanation:

The average atomic mass of strontium can be calculated by taking the sum of the product of the atomic mass of each isotope and its respective natural abundance. In this case, the atomic masses are 84, 86, 87 and 88 for Sr-84, Sr-86, Sr-87, and Sr-88 respectively. The natural abundances in decimal form are 0.0056, 0.0986, 0.0700 and 0.8258 respectively.

By performing these multiplications and summing up the four products, we can estimate the weighted average or effective atomic mass of strontium: (84*0.0056) + (86*0.0986) + (87*0.0700) + (88*0.8258).The computation gives the average atomic mass of strontium as approximately 87.62 atomic mass units (amu) .

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