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Author Question: Radium occurs only in uranium ores, typically with an observed Ra/U ratio of 1mg/3kg. Uranium ores ... (Read 35 times)

audragclark

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on: Feb 15, 2020

Question 1

If the age of the Earth is 4.5 billion years and the half-life of 40K is 1.26 billion years, what percent of the Earth's original amount of 40K remains today?
◦ 16%
◦ 4.2%
◦ 8.4%
◦ 12%

Question 2

Radium occurs only in uranium ores, typically with an observed Ra/U ratio of 1mg/3kg. Uranium ores normally contain only about 200 ppm of U. How many kilograms of uranium ore must be processed to obtain 1 mg of radium?
◦ 6.0 × 108 kg ore
◦ 15,000 kg ore
◦ 1700 kg ore
◦ None of these
Chemistry ¦ McMurry, Fay, Robinson ¦ 7th Edition
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Marked as best answer by audragclark on Feb 15, 2020

jessicaduplan

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Reply #1 on: Feb 15, 2020
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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audragclark

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Reply 2 on: Feb 15, 2020
Thanks for the timely response, appreciate it

nguyenhoanhat

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Reply 3 on: Yesterday
Wow, this really help

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