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Calculate the standard enthalpy of formation of `CH_(3)OH(l)` from the following data: `CH_(3)OH(l)+3/2O_(2)(g) rarr CO_(2)(g)+2H_(2)O(l), …(i), Delta_(r)H_(1)^(Θ)=-726 kJ mol^(-1)` `C(g)+O_(2)(g) rarr CO_(2)(g), …(ii), Delta_(c )H_(2)^(Θ)=-393 kJ mol^(-1)` `H_(2)(g)+1/2O_(2)(g) rarr H_(2)O(l), ...(iii), Delta_(f)H_(3)^(Θ)=-286 kJ mol^(-1)` |
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Answer» `C(s)+2H_(2)(g)+1/2O_(2)(g)rarr CH_(3)OH(l), Delta_(f)H^(Θ)=`? Equation (ii) `+2xx"Equation"` (iii) -Equation (i) gives the required equation with `DeltaH=-393+2(-286)-(-726)kJ "mol"^(-1)=-239 kJ "mol"^(-1)` |
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