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Chemistry, 20.02.2020 22:20 issagirl23
The activity of a radioactive sample is the number of nuclear disintegrations per second, which is equal to the first order rate constant times the number of radioactive nuclei present. the fundamental unit of radioactivity is the curie (Ci) where 1Ci corresponds to exactly 3.7x10^10 disintegrations per second. this decay rate is equivalent to that of 1g of radium-226. Calculate the rate constant and half life for the radium decay. starting with 2.6g of the radium sample, what is the activity after 450yr? The molar mass of Ra is 226.03 g/mol.
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Chemistry, 22.06.2019 22:00
4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.
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The activity of a radioactive sample is the number of nuclear disintegrations per second, which is e...
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