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1. Calculate the average atomic mass of rubidium. Rubidium has two isotopes, 85Rb and 87Rb. 85Rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17%. 87Rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83%.
KiwiLiv KiwiLiv 18-21, F 7 Answers Mar 9 in Doing Good

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Average Atomic Mass = (Mass of isotope A ∗ % Abundance of isotope A) + (Mass of isotope B ∗ % Abundance of isotope B) <br />
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Average Atomic Mass = (84.912 ∗ 0.7217) + (86.909 ∗ 0.2783) <br />
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Average Atomic Mass = 61.2809904 + 24.1867747<br />
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85.4677651 = 61.2809904 + 24.1867747<br />
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Average Atomic Mass = 85.4677651

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85.4677651.... Math. Lazy.

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Are you calling me lazy? I didn't know how or what to do...

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85.468 .... Do 72.17% of 84.912 and add it to 27.83% of 86.909 .... I think anyway lol.

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No , do your own homework

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Its course work, so? I'm Sorry i do school on the computer and its not to your standard. I dont have someone here to help me, im sorry i tried to find help.

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42 XD

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