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A gas absorbs 200J of heat and expands a...

A gas absorbs `200J` of heat and expands against the external pressure of `1.5 atm` from a volume of `0.5` litre to `1.0` litre. Calculate the change in internal energy.

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`w=-PDeltaU`
`=-1.5xx(1.0-0.5)`
`=-0.75` litre atm
`=-0.75xx101.3 J`
`:. 1` liter -atm `=101.3 J`
Now, `DeltaU=200-75.975`
`=+124.025 J`
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