Chemistry

Problem

A 3.60 g sample of radium-226 (atomic mass = 226 g mol

^{-1}

) has an initial activity of

1.00 \times 10^{11}

decays s

^{-1}

. (Use

N_A = 6.022 \times 10^{23}\,\text{mol}^{-1}

.) a. (i) Determine the decay constant of radium-226. b. (ii) Calculate the half-life of radium-226 in years. c. (iii) After how many years will the activity fall to

2.50 \times 10^{10}

decays s

^{-1}

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