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Author Question: Bromine has two naturally occurring isotopes, Br-79 and Br-81. The mass of Br-79 is 78.92 u with a ... (Read 174 times)

MirandaLo

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Question 1

Cerium has four stable isotopes listed below. If the weighted average atomic mass of cerium is 140.116 u, calculate the atomic mass of cerium-142.

Ce-136135.90714 u0.19%
Ce-138137.90599 u0.25%
Ce-140139.90543 u88.43%
Ce-14211.13%

◦ 142.617 u
◦ 139.886 u
◦ 140.334 u
◦ 142.501 u
◦ 141.911 u

Question 2

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The mass of Br-79 is 78.92 u with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 u, calculate the mass and percent abundance of Br-81.


◦ 80.028 u and 50.31%
◦ 78.921 u and 49.31%
◦ 80.916 u and 49.31%
◦ 80.916 u and 50.69%
◦ 79.904 u and 49.31%


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Marked as best answer by MirandaLo on Nov 18, 2019

frogdreck123456

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MirandaLo

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Reply 2 on: Nov 18, 2019
Gracias!


samiel-sayed

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Reply 3 on: Yesterday
Great answer, keep it coming :)

 

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