1.

Calculate the standard enthalpy of formation of acetylena from the following data: `C(s)+O_(2)(g)to CO_(2)(g), DeltaH^(@)=-393.5KJmol^(-1)` `H_(2)(g)+(1)/(2)O_(2)(g)to H_(2)O(l),DeltaH^(@)=-285.8KJmol^(-1)` `2C_(2)H_(2)(g)+50_(2)(g)to 4Co_(2)(g)+2H_(2)O(l0,``DeltaH^(@)=-2598.8KJmol^(-1)`A. `226.6KJmol^(-1)`B. `230.5KJmol^(-1)`C. `233.8KJmol^(-1)`D. none of these

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