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

A gas is allowed to expand in a well insulated container against a constant extremal pressure of 2.5 bar from an initial volume of 2.5 L to a final volume of 4.5L.The change in internal energy. `DeltaU` of the gas will be

`-505J`

`+505J`

`-1013J`

`1013J`

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