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A tightly sealed 25.0 litre acetone drum...

A tightly sealed `25.0` litre acetone drum was found to have `15.4` litre acetone (l) at `780mm` hg pressure and `18^(@)C` Sudddenly during transportaion the drum was dented and its internal volume was found th decrease by `4.6` litre If vapour pressure of acetone at `18^(@)C` is `400mm` of Hg calculate the pressure inside the drum after denting .

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The correct Answer is:
`1129.6 mm`
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