Chemistry, 01.07.2020 18:01 nate102201
Since the half life of U-235 (7.13E8 yrs.) is less than the half life of U-238 (4.51E9 yrs.) the isotopic abundance of U-235 has been decreasing relative to U-238 since the earth was formed about 4.5 billion years ago. Fission products have been found which indicate that natural reactors have existed in Africa (read Sec 4.9). This would likely have required the enrichment to be about 3.0 a/o. Currently U-235 is only 0.72 a/o or 0.711 w/o of natural U. Estimate how many years ago the natural enrichment of Uranium was 3.0 a/o. Note that a rigorous calculation would require accounting for the mass difference between U-235 and U238, and for the decay of U-238
Answers: 3
Chemistry, 22.06.2019 00:30
Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?
Answers: 2
Chemistry, 22.06.2019 00:30
This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.
Answers: 1
Chemistry, 22.06.2019 03:30
At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k
Answers: 1
Since the half life of U-235 (7.13E8 yrs.) is less than the half life of U-238 (4.51E9 yrs.) the iso...
SAT, 29.08.2020 03:01
Mathematics, 29.08.2020 03:01
Advanced Placement (AP), 29.08.2020 03:01
English, 29.08.2020 03:01