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Author Question: A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in ... (Read 32 times)

bvyeehaw

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on: Nov 5, 2023

Question 1

A balanced nuclear equation representing the beta emission of iodine-131 is which of the following?
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Question 2

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238.  Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for 238U → 206Pb is 4.5 × 109 yr.)
◦ 1.32 atoms
◦ 5.8 × 10–6 atoms
◦ 2.4 × 1018 atoms
◦ 3.5 × 1018 atoms
◦ 3.5 × 1021 atoms
Chemistry ¦ Chang, Goldsby ¦ 11th Edition
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Marked as best answer by bvyeehaw on Nov 5, 2023

butterfly17

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Reply #1 on: Nov 5, 2023
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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bvyeehaw

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Reply 2 on: Nov 5, 2023
Excellent

tandmlomax84

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Reply 3 on: Yesterday
Gracias!

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