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For a gaseous reaction, 2SO(2)+O(2)to2...

For a gaseous reaction,
`2SO_(2)+O_(2)to2SO_(3),DeltaH=-440kJ//"mole"`
at a temperature of 300 K. Calculate `DeltaU` when 1 mole of `SO_(2)` is completely reacted with 1 mole of `O_(2)` in a 10 litre rigid vessel at an initial pressure of 50 bar which decreases to 20 bar.

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