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Author Question: How many atoms of rubidium-85 are in 87.2 g of rubidium? Rubidium-85 is 72.2 % abundant. (Read 110 times)

fbq8i

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on: Jul 8, 2021

Question 1

How many atoms of lead are required to cover a 33.0 cm by 45.0 cm area with a sheet of lead that is 0.140 mm thick? The density of lead is 11.35 g/cm3.
◦ 6.86 × 1023
◦ 2.29 × 1026
◦ 2.29 × 1025
◦ 6.86 × 1022
◦ 1.42 × 1026

Question 2

How many atoms of rubidium-85 are in 87.2 g of rubidium?  Rubidium-85 is 72.2 % abundant.
◦ 5.16 × 1046 atoms
◦ 4.46 × 1023 atoms
◦ 8.51 × 1023 atoms
◦ 6.14 × 1022 atoms
◦ 1.02 × 1024 atoms
General Chemistry: Principles and Modern Applications ¦ Petrucci, Herring, Madura, Bissonnette ¦ 11th Edition
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Marked as best answer by fbq8i on Jul 8, 2021

brbarasa

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Reply #1 on: Jul 8, 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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fbq8i

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Reply 2 on: Jul 8, 2021
Excellent

amcvicar

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Reply 3 on: Yesterday
Wow, this really help

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