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 1 Ci corresponds to exactly 3.70 x 1010
disintegrations per second. This decay rate is
equivalent to that of 1 g of radium-226. Calculate
the rate constant and half-life for the radium
decay. Starting with 1.0 g of the radium sample,
what is the activity after 500 yr? The molar mass of
Ra-226 is 226.03 g/mol?
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