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Introductory Physics Homework Help
Finding the Specific Activity of Rubidium Chloride
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[QUOTE="Phillyfan321, post: 4873108, member: 524771"] [h2]Homework Statement [/h2] The element rubidium consists of two isotopes, the stable 85Rb and radioactive 87Rb (abundance 27.83%). What is the specific activity of natural rubidium chloride? Use Ar85.47 gmol-1 for rubidium element, Ar 86.91 gmol-1 for 87Rb, and Mr 120.92 gmol-1 for RbCl. [h2]Homework Equations[/h2] A2 = ([B]λ2A1 /[B]λ2-[B]λ1) (e^-[B]λ2 *t)[/B][/B][/B][/B] M = (N#/ avag const)* Ar [h2]The Attempt at a Solution[/h2] I tried to convert 1g (subjective choice) of RbCl to 5 x 10^21 molecules, then apply percent abundance to get 1.4 x 10^21 Rb87. I converted that back to grams and got .2. I really don't know if I am on the right track or not, because I can't seem to figure out where I am going with this and if I need the other Ar value. Thanks. [/QUOTE]
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Introductory Physics Homework Help
Finding the Specific Activity of Rubidium Chloride
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