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""88^@224Ra having t(1//2) = 3.64d emi...

`""_88^@224Ra` having `t_(1//2)` = 3.64d emits an a particle to form `""_(86)^(220)Rn` , which has `t_(1//2)` = 54.5 s. Given that the molar volume of radon under these conditions is `35.2 dm^3` , what volume of radon is in secular equilibrium with 1 g of radium?

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`2.72 xx 10^(-8) m^3`
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