Chemistry, 07.05.2021 20:00, brooke012002
An ancient club is found that contains 140 g of pure carbon and has an activity of 4.5 decays per second. Determine its age assuming that in living trees the ratio of atoms is about . Note that the half life of carbon-14 is 5700 years and the Avogadro number is . years 2. One of the many isotopes used in cancer treatment is , with a half-life of 2.70 d. Determine the mass of this isotope that is required to give an activity of 205 Ci. mg 3. The radioactive isotope ( Mo) has a half-life of 2.75 days. A sample containing this isotope has an initial activity at (t
Answers: 2
Chemistry, 22.06.2019 14:00, asanchez4292
What type of matter is made of only one kind of atom
Answers: 2
Chemistry, 22.06.2019 19:20, johnkings140
For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)
Answers: 1
Chemistry, 22.06.2019 19:30, Karinaccccc
How might this scientific phenomena be explained? a paper clip floats on water.
Answers: 1
An ancient club is found that contains 140 g of pure carbon and has an activity of 4.5 decays per se...
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