A balloon is 1m in diameter and contain ...

A balloon is 1m in diameter and contain air at `25^(@)C` and 1 bar pressure. It is filled with air isothermally and reversibly until the pressure reaches 5bar. Assume pressure is propotional to diameter of ballon. Calulate work done by air `(atm ,m^(3))`

`78pi`

`156pi`

`624pi`

`625pi`

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