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""(84)Po""^(210) decays with a particle ...

`""_(84)Po""^(210)` decays with a particle to `""_(82)Pb""^(206)` with a half life of 138.4 days. If 1.0 g of `""_(84)Po""^(210)` is placed in a sealed tube, how much helium will accumulate in 69.2 days. Express the answer in `cm""^(3)` at STP

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