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Calculate the enthalpy change(triangleH)...

Calculate the enthalpy change(`triangleH`) for the following reaction.
`2C_2H_2(g)+5O_2(g)rarr4CO_2(g)+2H_2O`
Given : Average bond energies of varisous bonds C-H, `CequivC`, O=O, C=O, O-H are 414, 814, 499, 724, 640 kJ `mol^-` respectively.

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