Answer:
The required equation is:
\[C(s)+2{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to
C{{H}_{3}}OH(l)\]
The given
equations can be rearranged as:
(i) \[C{{O}_{2}}(g)+2{{H}_{2}}O(l)\to
C{{H}_{3}}OH(l)+\frac{3}{2}{{O}_{2}}(g);\]
\[{{\Delta
}_{r}}{{H}^{{}^\circ }}=726kJmo{{l}^{-1}}\]
(ii) \[C(s)+{{O}_{2}}(g)\to
C{{O}_{2}}(g);\]
\[{{\Delta
}_{c}}{{H}^{{}^\circ }}=-393kJ\,mo{{l}^{-1}}\]
(iii) \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to
2{{H}_{2}}O(l);\]
\[{{\Delta
}_{f}}{{H}^{{}^\circ }}=-286\times 2kJmo{{l}^{-1}}\]
\[\frac{On\,adding,}{\frac{C(s)+2{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to
C{{H}_{3}}OH(l);\Delta H=-239kJmo{{l}^{-1}}}{{}}}\]
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