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[" 24.A balloon of diameter "20m" weight...

[" 24.A balloon of diameter "20m" weights "100kg" .Calculate its pay load,if it is filled "],[" with He at "1.0" atm.and "27^(@)c" .Density of air is "1.2kgm^(-3)],[(R=0.08dm^(1)" atm "K^(-1)mol^(-1))(pi=3.15)],[[" A) "4640kg," B) "4240kg," C) "2320kg," D) "2170kg]]

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