A gas is allowed to expand in a well ins...

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. the change in internal energy `DeltaU` of the gas in joules will be-

`1136.25 J`

`-500 J`

`-505 J`

`+ 505 J`

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