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One mole of SO(2) at 298K and 1atm press...

One mole of `SO_(2)` at `298K` and `1atm` pressure is heated in a closed vessel so that its temperature is `475K` and pressure is `4atm`. It is then cooled so that temperature becomes `298K` and pressure is `1atm`. What is that change in the internal energy of the gas?

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No change in the internal energy because it is a state function.
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