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Consider an initially pure `M gm` sample of `X`, an isotope that has a half-life of `T` hour, what is its initial decay rate (`N_A` = Avogadro No, atomic weight of `X` is `A`)
A. `(M N_(A))/(T)`
B. `(0.693 M N_(A))/(T)`
C. `(0.693 M N_(A))/(AT)`
D. `(2.303 M N_(A))/(A T)`

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