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Calculate Delta Hr^@ for the reaction C2...

Calculate `Delta H_r^@` for the reaction `C_2H_4+3O_2rarr 2CO_2+2H_2O` the average bond enthalpies of various bonds are
Bond `C-H O=O C=O O-H C=C
Bond enthalpy `KJ mol^(-1)` 414,499,724,460,619

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