Answer:
\[C{{H}_{4}}(g)+2{{O}_{2}}(g)\to
C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]
\[\Delta
{{n}_{g}}=1-3=-2\]
\[\Delta
{{H}^{{}^\circ }}=\Delta {{U}^{{}^\circ }}-2RT\]
\[\Delta
{{H}^{{}^\circ }}=-X-2RT\]
\[\Delta
{{H}^{{}^\circ }}
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