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A certain radioactive isotope decay has ...

A certain radioactive isotope decay has `alpha`-emission,
`._(Z_(1))^(A_(1))X to ._(Z_(1)-2)^(A_(1)-4)Y`
half life of X is 10 days. If 1 mol of X is taken initially in a sealed container, then what volume of helium will be collected at STP after 20 days?

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The correct Answer is:
`73.1xx10^(-3)g`
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