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The astronaut then measures the abundance of strontium on the new planet, obtaining the following results: Isotope Abundance (%) Mass (amu) 86Sr 9.46 85.91 87Sr 7.00 86.91 88Sr 83.54 87.91 What is the
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The astronaut then measures the abundance of strontium on the new planet, obtaining the following results:

Isotope Abundance
(%) Mass
(amu)
86Sr 9.46 85.91
87Sr
7.00 86.91
88Sr 83.54 87.91
What is the atomic mass of strontium for this planet?

User Rpophessagr
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1 Answer

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Atomic mass is equal to the average number allowing for the relative abundances of different isotopes. It is calculated by:

Atomic mass = ΣzₓAₓ

where zₓ is the relative abundance of the isotope and Aₓ is the atomic mass of the isotope.

Atomic mass = (0.0946x85.91) + (0.07x86.91) + (0.8354x87.91) = 87.6508 amu
User Duy Nguyen
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