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X(86)^(214) is a radioactive substance a...

`X_(86)^(214)` is a radioactive substance and it decomposes by `alpha`-decay into stable `Pb_(82)^(206)`. The half life of decay of `X` into `Pb` is `138.6` days. If `1` mole of `X` is placed in a closed tube, then in `69.3` days, the amount of a particle (in moles) accumulated in the tube is (approx)

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