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Author Question: Naturally occurring copper has two isotopes: copper-63 (62.9296 amu) and copper-65 (64.9278 amu). ... (Read 146 times)

OSWALD

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on: Mar 21, 2021
Naturally occurring copper has two isotopes: copper-63 (62.9296 amu) and copper-65 (64.9278 amu). Using the average atomic mass from the periodic table, which of the following is the best estimate of the percent abundance of the two isotopes of copper?

◦ 50% copper-63 and 50% copper-65
◦ 25% copper-63 and 75% copper-65
◦ 75% copper-63 and 25% copper-65
◦ 90% copper-63 and 10% copper-65
◦ 10% copper-63 and 90% copper-65
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Marked as best answer by OSWALD on Mar 21, 2021

welcom1000

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Reply #1 on: Mar 21, 2021
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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OSWALD

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Reply 2 on: Mar 21, 2021
Excellent

frankwu0507

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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