Timeline for What is the Natural abundance of Potassium
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Oct 30, 2015 at 16:55 | history | edited | Todd Minehardt |
edited tags
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| May 19, 2015 at 6:23 | history | edited | ringo | CC BY-SA 3.0 |
formatting, removed unnecessary information
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| Sep 29, 2014 at 6:14 | answer | added | John Snow | timeline score: 1 | |
| Sep 29, 2014 at 1:42 | comment | added | user137452 | What should I place in the unknown areas? (0.932581-1) and (1-x)? | |
| Sep 29, 2014 at 1:41 | comment | added | user137452 | Okay so the set up would be 39.0983u = (fractional abundance isotope-39 [0.932581]x 38.963707u) + (fractional abundance isotope-41 [0.067302] x mass [unknown]) + (fractional abundance isotope k-40 [unknown] x 39.963999) | |
| Sep 29, 2014 at 1:31 | comment | added | Greg | As I said, one way to answer a) is that you assume the three isotope fractions should add up 100%. | |
| Sep 29, 2014 at 1:27 | comment | added | user137452 | How do I solve for part a in the question? Do I utilize the formula that I wrote with the question? | |
| Sep 29, 2014 at 1:25 | comment | added | Greg | Sorry, can you rephrase your question? What is three or two? What do you want to set up? | |
| Sep 29, 2014 at 1:22 | comment | added | user137452 | All three or just the two? And if so how should I set them up? Thanks in advance. | |
| Sep 29, 2014 at 1:19 | history | edited | Greg | CC BY-SA 3.0 |
formatted isotopic labels
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| Sep 29, 2014 at 1:15 | comment | added | Greg | You can answer a) from the fact that they should add up to 100%. To answer b) you either need to know atomic mass (available from periodic table, if you are allowed to use) or can make e.g an approximation that an added neutron's mass is more or less that same. | |
| Sep 29, 2014 at 1:08 | history | edited | user137452 | CC BY-SA 3.0 |
added 2 characters in body
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| Sep 29, 2014 at 1:01 | history | asked | user137452 | CC BY-SA 3.0 |