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The enthalpies of combustion of C(2)H(2)...

The enthalpies of combustion of `C_(2)H_(2)(g)` and `C(2)H_(6)(g)` are -1301 kJ and -1561.5 kJ respectively. The enthalpy of formation of liquid water is -286 kJ. Calculate the enthalpy change for the reaction :
`C_(2)H_(2)(g) + 2H_(2)(g) to C_(2)H_(2)(g)` .

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