(Answered) A 538-mg sample of sodium perchlorate contains radioactive

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A 53.8-mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder are naturally occurring no radioactive chlorine atoms, how many disintegrations per second are produced by this sample? The half life of chlorine-36 is 3.0*10^5 yr.

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