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One mole of A present in a closed vessel...

One mole of A present in a closed vessel undergoes decay as, `""_(z)^(m)A to ""_(z-4)^(m-8)B + 2(""_(2)^(4)He)`. what will be the volume of helium collected after 20 days at STP?,(half life of A=10 days)

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The correct Answer is:
9
`""_(z)^(m)A to ""_(z-4)^(m-8)B + 2(""_(2)^(4)He)`
a initial mole
`a -x - 2x` moles after time t.
No. of moles of He gas = 1.5 moles. Initial moles of A = 1 moles.
After 18 days moles of A remains = 0.25 So half life = 9 days.
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