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Calculate the standard internal energy c...

Calculate the standard internal energy change for the following reactions at `25^(@)C`:
`2H_(2)O_(2)(l) rarr 2H_(2)O(l) +O_(2)(g)`
`Delta_(f)H^(Theta) at 25^(@)C` for `H_(2)O_(2)(l) =- 188 kJ mol^(-1) H_(2)O(l) =- 286 kJ mol^(-1)`

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DeltaH^(@) " of " H_(2)O_((l)) is ………… KJ/mol.