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Calculate the enthalpy change (Delta H) ...

Calculate the enthalpy change `(Delta H)` of the following reaction
`2C_(2)H_(2)(g)+5O_(2)(g)rarr4CO_(2)(g)+2H_(2)O(g)` given average bond enthalpies of various bonds, i.e., `C-H,C-=C,O=O,C=O,O-H` as `414,814,499,724` and `640 kJ mol^(-1)` respectively.

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Verified by Experts

The correct Answer is:
`-2573 kJ//"mole"`

`DeltaH_(f)=2[DeltaH_(C=C)+2 Delta H_(C-H)]+5 DeltaH_(o=o)-4[ 2DeltaH_(C=O)]-2[2DeltaH_(O-H)]`
`DeltaH_(r )=2[814+2xx414]+5[499]-[8xx724]-4[640]=3284+2495-5792-2560= -2573 kJ//"mole"`
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