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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 120 times)

MirandaLo

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on: Nov 18, 2019

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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Reply #1 on: Nov 18, 2019
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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MirandaLo

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Reply 2 on: Nov 18, 2019
YES! Correct, THANKS for helping me on my review

ebonylittles

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Reply 3 on: Yesterday
Gracias!

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